Agrega DERs.

Se agregan DERs actualizados y separados en varios archivos para que sean
legibles.

diff --git a/doc/schema/curso.dia b/doc/schema/curso.dia
new file mode 100644 (file)
index 0000000..1dfcf1c
--- /dev/null
+++ b/doc/schema/curso.dia
@@ -0,0 +1,1754 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<dia:diagram xmlns:dia="http://www.lysator.liu.se/~alla/dia/">
+  <dia:diagramdata>
+    <dia:attribute name="background">
+      <dia:color val="#ffffff"/>
+    </dia:attribute>
+    <dia:attribute name="pagebreak">
+      <dia:color val="#000099"/>
+    </dia:attribute>
+    <dia:attribute name="paper">
+      <dia:composite type="paper">
+        <dia:attribute name="name">
+          <dia:string>#A4#</dia:string>
+        </dia:attribute>
+        <dia:attribute name="tmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="bmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="lmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="rmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="is_portrait">
+          <dia:boolean val="true"/>
+        </dia:attribute>
+        <dia:attribute name="scaling">
+          <dia:real val="0.66474455595016479"/>
+        </dia:attribute>
+        <dia:attribute name="fitto">
+          <dia:boolean val="true"/>
+        </dia:attribute>
+        <dia:attribute name="fitwidth">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:attribute name="fitheight">
+          <dia:int val="1"/>
+        </dia:attribute>
+      </dia:composite>
+    </dia:attribute>
+    <dia:attribute name="grid">
+      <dia:composite type="grid">
+        <dia:attribute name="width_x">
+          <dia:real val="1"/>
+        </dia:attribute>
+        <dia:attribute name="width_y">
+          <dia:real val="1"/>
+        </dia:attribute>
+        <dia:attribute name="visible_x">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:attribute name="visible_y">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:composite type="color"/>
+      </dia:composite>
+    </dia:attribute>
+    <dia:attribute name="color">
+      <dia:color val="#d8e5e5"/>
+    </dia:attribute>
+    <dia:attribute name="guides">
+      <dia:composite type="guides">
+        <dia:attribute name="hguides"/>
+        <dia:attribute name="vguides"/>
+      </dia:composite>
+    </dia:attribute>
+  </dia:diagramdata>
+  <dia:layer name="Fondo" visible="true">
+    <dia:object type="UML - LargePackage" version="0" id="O0">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-18,-4"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-18.05,-5.05;5.05,31.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-18,-4"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="23"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="35"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#Curso#</dia:string>
+      </dia:attribute>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O1">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-14,24"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-14.05,23.95;-6.1,29.65"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-14,24"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.8499999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="5.5999999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#curso#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#anio#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#cuatrimestre#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#numero#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#descripcion#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O2">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-5,-3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-5.05,-3.05;2.9,2.65"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-5,-3"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.8499999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="5.5999999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#enunciado#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#nombre#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#descripcion#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Descripción un poco más detallada del ejercicio#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#autor_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Autor#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#creado#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O3">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-9.2,1.3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-9.25,-0.9;-5.00049,2.2"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="-9.2,1.3"/>
+        <dia:point val="-7.12524,1.3"/>
+        <dia:point val="-7.12524,-0.2"/>
+        <dia:point val="-5.05049,-0.2"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#* #</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># 1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O5" connection="15"/>
+        <dia:connection handle="1" to="O2" connection="18"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O4">
+      <dia:attribute name="obj_pos">
+        <dia:point val="2.85,1.3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="0.05,0.6;3.95,19.6"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="2.85,1.3"/>
+        <dia:point val="3.85,1.3"/>
+        <dia:point val="3.85,18.7"/>
+        <dia:point val="0.1,18.7"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#* #</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O2" connection="15"/>
+        <dia:connection handle="1" to="O9" connection="4"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O5">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-16,-3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-16.05,-3.05;-9.15,2.65"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-16,-3"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="6.7999999999999998"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="5.5999999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#ejercicio#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#curso_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#numero#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#enunciado_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#grupal#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Es grupal (o individual)#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O6">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-16,-0.3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-17.05,-1;-13.95,25.6"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="-16,-0.3"/>
+        <dia:point val="-17,-0.3"/>
+        <dia:point val="-17,24.7"/>
+        <dia:point val="-14,24.7"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#*#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O5" connection="10"/>
+        <dia:connection handle="1" to="O1" connection="3"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O7">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-11,5"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-11.05,4.95;-3.1,14.65"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-11,5"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.8499999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="9.5999999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#usuario#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#tipo#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#CHAR(1)#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Tipo de usuario para polimorfismo: 'd' (docente), 'a' (alumno) o 'u' (usuario, en realidad no debería estar nunca).#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="1"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#usuario#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Para alumnos es el padrón, para docentes el usuario que les plazca (que no pueda ser un padrón válido).#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#email#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#contrasenia#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#nombre#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#telefono#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#creado#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#activo#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#observaciones#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#TEXT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Note" version="0" id="O8">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-2,26"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-2.05,25.95;3.85,30.15"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-2,26"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="5.8000000000000007"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="4.1000000000000005"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text">
+        <dia:composite type="text">
+          <dia:attribute name="string">
+            <dia:string>#_ es PK física
+# es PK lógica
+- es para
+  polimorfismo#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="font">
+            <dia:font family="monospace" style="0" name="Courier"/>
+          </dia:attribute>
+          <dia:attribute name="height">
+            <dia:real val="0.80000000000000004"/>
+          </dia:attribute>
+          <dia:attribute name="pos">
+            <dia:point val="-1.65,27.2"/>
+          </dia:attribute>
+          <dia:attribute name="color">
+            <dia:color val="#000000"/>
+          </dia:attribute>
+          <dia:attribute name="alignment">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O9">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-6,18"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-6.05,17.95;0.15,21.25"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-6,18"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="6.0999999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="3.2000000000000002"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#docente#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#usuario_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#nombreado#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+    </dia:object>
+    <dia:object type="UML - Generalization" version="1" id="O10">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-7.075,14.6"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-7.925,14.55;-2.9,18.05"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="-7.075,14.6"/>
+        <dia:point val="-7.075,16.3"/>
+        <dia:point val="-2.95,16.3"/>
+        <dia:point val="-2.95,18"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O7" connection="6"/>
+        <dia:connection handle="1" to="O9" connection="1"/>
+      </dia:connections>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O11">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-14,18"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-14.05,17.95;-7.85,21.25"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-14,18"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="6.0999999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="3.2000000000000002"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#alumno#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#usuario_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#nota#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#FLOAT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+    </dia:object>
+    <dia:object type="UML - Generalization" version="1" id="O12">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-7.075,14.6"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-11,14.55;-6.225,18.05"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="-7.075,14.6"/>
+        <dia:point val="-7.075,16.3"/>
+        <dia:point val="-10.95,16.3"/>
+        <dia:point val="-10.95,18"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O7" connection="6"/>
+        <dia:connection handle="1" to="O11" connection="1"/>
+      </dia:connections>
+    </dia:object>
+  </dia:layer>
+</dia:diagram>

diff --git a/doc/schema/entregas.dia b/doc/schema/entregas.dia
new file mode 100644 (file)
index 0000000..da27b2a
--- /dev/null
+++ b/doc/schema/entregas.dia
@@ -0,0 +1,4063 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<dia:diagram xmlns:dia="http://www.lysator.liu.se/~alla/dia/">
+  <dia:diagramdata>
+    <dia:attribute name="background">
+      <dia:color val="#ffffff"/>
+    </dia:attribute>
+    <dia:attribute name="pagebreak">
+      <dia:color val="#000099"/>
+    </dia:attribute>
+    <dia:attribute name="paper">
+      <dia:composite type="paper">
+        <dia:attribute name="name">
+          <dia:string>#A4#</dia:string>
+        </dia:attribute>
+        <dia:attribute name="tmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="bmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="lmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="rmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="is_portrait">
+          <dia:boolean val="true"/>
+        </dia:attribute>
+        <dia:attribute name="scaling">
+          <dia:real val="0.41389757394790649"/>
+        </dia:attribute>
+        <dia:attribute name="fitto">
+          <dia:boolean val="true"/>
+        </dia:attribute>
+        <dia:attribute name="fitwidth">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:attribute name="fitheight">
+          <dia:int val="1"/>
+        </dia:attribute>
+      </dia:composite>
+    </dia:attribute>
+    <dia:attribute name="grid">
+      <dia:composite type="grid">
+        <dia:attribute name="width_x">
+          <dia:real val="1"/>
+        </dia:attribute>
+        <dia:attribute name="width_y">
+          <dia:real val="1"/>
+        </dia:attribute>
+        <dia:attribute name="visible_x">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:attribute name="visible_y">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:composite type="color"/>
+      </dia:composite>
+    </dia:attribute>
+    <dia:attribute name="color">
+      <dia:color val="#d8e5e5"/>
+    </dia:attribute>
+    <dia:attribute name="guides">
+      <dia:composite type="guides">
+        <dia:attribute name="hguides"/>
+        <dia:attribute name="vguides"/>
+      </dia:composite>
+    </dia:attribute>
+  </dia:diagramdata>
+  <dia:layer name="Fondo" visible="true">
+    <dia:object type="UML - LargePackage" version="0" id="O0">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-18,-4"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-18.05,-5.05;19.05,53.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-18,-4"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="37"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="57"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#Entregas#</dia:string>
+      </dia:attribute>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O1">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-17,39"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-17.05,38.95;-14.2,40.45"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-17,39"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="2.75"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="1.3999999999999999"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#curso#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes"/>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O2">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-10,-2"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-10.05,-2.05;-0.8,6.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-10,-2"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="9.1500000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="8"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#instancia_de_entrega#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#ejercicio_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#A que ejercicio pertenece la entrega#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#numero#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Número de entrega (1ra instancia, 2da instancia, etc.)#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#inicio#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Fecha en la que se puede empezar a entregar#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#fin#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Fecha en la que vence la entrega#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#procesada#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Indica si fue procesada la entrega o no#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#activo#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#observaciones#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#TEXT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O3">
+      <dia:attribute name="obj_pos">
+        <dia:point val="5,-3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="4.95,-3.05;12.55,3.45"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="5,-3"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.5"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="6.4000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#entrega#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#instancia_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#entregador_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#fecha#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#correcta#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#observaciones#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#TEXT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O4">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-9,33"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-9.05,32.95;-1.55,38.65"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-9,33"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.4000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="5.5999999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#alumno_inscripto#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#entregador_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#alumno_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#curso_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#condicional#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#tutor_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O5">
+      <dia:attribute name="obj_pos">
+        <dia:point val="8,5"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="7.95,4.95;15.55,13.85"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="8,5"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.5"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="8.7999999999999989"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#correccion#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#instancia_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#entregador_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#entrega_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#corrector_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#asignado#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Fecha en que se asigno la entrega al corrector#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#corregido#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Fecha en que se terminó de corregir (se puso la nota)#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#nota#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#FLOAT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#observaciones#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#TEXT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O6">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-9,36.5"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-14.3,35.8;-8.95,40.6"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="-9,36.5"/>
+        <dia:point val="-11.625,36.5"/>
+        <dia:point val="-11.625,39.7"/>
+        <dia:point val="-14.25,39.7"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#*#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O4" connection="12"/>
+        <dia:connection handle="1" to="O1" connection="4"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O7">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-1.6,35.7"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-1.65,35;2.05,40.6"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="-1.6,35.7"/>
+        <dia:point val="0.2,35.7"/>
+        <dia:point val="0.2,39.7"/>
+        <dia:point val="2,39.7"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#*#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O4" connection="11"/>
+        <dia:connection handle="1" to="O27" connection="3"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O8">
+      <dia:attribute name="obj_pos">
+        <dia:point val="5,-0.3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-5.475,-3.7;5.05,0.6"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="5,-0.3"/>
+        <dia:point val="4,-0.3"/>
+        <dia:point val="4,-3"/>
+        <dia:point val="-5.425,-3"/>
+        <dia:point val="-5.425,-2"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># *#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># 1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O3" connection="10"/>
+        <dia:connection handle="1" to="O2" connection="1"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O9">
+      <dia:attribute name="obj_pos">
+        <dia:point val="8,10.1"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-10.2,9.4;8.05,17.8"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="8,10.1"/>
+        <dia:point val="-10.15,10.1"/>
+        <dia:point val="-10.15,17"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#* #</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># 1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O5" connection="16"/>
+        <dia:connection handle="1" to="O28" connection="1"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O10">
+      <dia:attribute name="obj_pos">
+        <dia:point val="8,8.5"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="3.6,7.8;8.05,24.1"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="8,8.5"/>
+        <dia:point val="6.77523,8.5"/>
+        <dia:point val="6.77523,23.2"/>
+        <dia:point val="5.55046,23.2"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>#alumno/grupo#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#* #</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># 1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O5" connection="12"/>
+        <dia:connection handle="1" to="O22" connection="20"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O11">
+      <dia:attribute name="obj_pos">
+        <dia:point val="15.5,9.3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="12.45,-3;18.1,10.2"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="15.5,9.3"/>
+        <dia:point val="18,9.3"/>
+        <dia:point val="18,-2.3"/>
+        <dia:point val="12.5,-2.3"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># 0..1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># 1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O5" connection="15"/>
+        <dia:connection handle="1" to="O3" connection="4"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O12">
+      <dia:attribute name="obj_pos">
+        <dia:point val="5,0.5"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="0.6,-0.2;5.05,20.8"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="5,0.5"/>
+        <dia:point val="1.75,0.5"/>
+        <dia:point val="1.75,20"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>#alumno/grupo#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># *#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># 1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O3" connection="12"/>
+        <dia:connection handle="1" to="O22" connection="1"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O13">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-17,-3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-17.05,-3.05;-12.9,-1.55"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-17,-3"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="4.0499999999999998"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="1.3999999999999999"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#ejercicio#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes"/>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O14">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-12.95,-2.3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-13,-3;-9.95,1.6"/>
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+      <dia:attribute name="orth_points">
+        <dia:point val="-12.95,-2.3"/>
+        <dia:point val="-11.475,-2.3"/>
+        <dia:point val="-11.475,0.7"/>
+        <dia:point val="-10,0.7"/>
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+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
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+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#*#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O13" connection="4"/>
+        <dia:connection handle="1" to="O2" connection="10"/>
+      </dia:connections>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O15">
+      <dia:attribute name="obj_pos">
+        <dia:point val="8,33"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="7.95,32.95;15.55,37.85"/>
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+      <dia:attribute name="elem_corner">
+        <dia:point val="8,33"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.5"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="4.8000000000000007"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#grupo#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
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+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
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+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
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+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
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+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
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+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
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+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
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+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#entregador_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
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+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#curso_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#nombre#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
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+          <dia:attribute name="comment">
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+          <dia:attribute name="name">
+            <dia:string>#responsable_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
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+          </dia:attribute>
+          <dia:attribute name="value">
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+          <dia:attribute name="comment">
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+      <dia:attribute name="elem_height">
+        <dia:real val="5.5999999999999996"/>
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+      <dia:attribute name="name">
+        <dia:string>#miembro#</dia:string>
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+      <dia:attribute name="stereotype">
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+      <dia:attribute name="comment">
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+        <dia:boolean val="true"/>
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+        <dia:int val="40"/>
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+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
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+        <dia:boolean val="false"/>
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+        <dia:color val="#000000"/>
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+        <dia:color val="#ffffff"/>
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+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
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+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
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+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
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+        <dia:real val="0.80000000000000004"/>
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+        <dia:real val="1"/>
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+        <dia:real val="1"/>
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+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
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+          <dia:attribute name="type">
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+          </dia:attribute>
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+          <dia:attribute name="comment">
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+          <dia:attribute name="comment">
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+          <dia:attribute name="name">
+            <dia:string>#nota#</dia:string>
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+          <dia:attribute name="name">
+            <dia:string>#alta#</dia:string>
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+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#tipo#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#CHAR(1)#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Tipo de entregador para polimorfismo: 'd' (docente), 'a' (alumno), 'g' (grupo) o 'e' (entregador, en realidad no debería estar nunca).#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="1"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#nota#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#FLOAT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#nota_cursada#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#FLOAT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#activo#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#observaciones#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#TEXT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+    </dia:object>
+    <dia:object type="UML - Generalization" version="1" id="O23">
+      <dia:attribute name="obj_pos">
+        <dia:point val="1.75,26.4"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-5.35,26.35;2.6,32.9997"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="1.75,26.4"/>
+        <dia:point val="1.75,29.6748"/>
+        <dia:point val="-5.3,29.6748"/>
+        <dia:point val="-5.3,32.9497"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O22" connection="6"/>
+        <dia:connection handle="1" to="O4" connection="18"/>
+      </dia:connections>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Generalization" version="1" id="O24">
+      <dia:attribute name="obj_pos">
+        <dia:point val="1.75,26.4"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="0.9,26.35;11.8,32.9997"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="1.75,26.4"/>
+        <dia:point val="1.75,29.6749"/>
+        <dia:point val="11.75,29.6749"/>
+        <dia:point val="11.75,32.9497"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="orth_autoroute">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O22" connection="6"/>
+        <dia:connection handle="1" to="O15" connection="16"/>
+      </dia:connections>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Note" version="0" id="O25">
+      <dia:attribute name="obj_pos">
+        <dia:point val="12,48"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="11.95,47.95;17.85,52.15"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="12,48"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="5.8000000000000007"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="4.1000000000000005"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text">
+        <dia:composite type="text">
+          <dia:attribute name="string">
+            <dia:string>#_ es PK física
+# es PK lógica
+- es para
+  polimorfismo#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="font">
+            <dia:font family="monospace" style="0" name="Courier"/>
+          </dia:attribute>
+          <dia:attribute name="height">
+            <dia:real val="0.80000000000000004"/>
+          </dia:attribute>
+          <dia:attribute name="pos">
+            <dia:point val="12.35,49.2"/>
+          </dia:attribute>
+          <dia:attribute name="color">
+            <dia:color val="#000000"/>
+          </dia:attribute>
+          <dia:attribute name="alignment">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O26">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-17,7"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-17.05,6.95;-13.15,8.45"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-17,7"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="3.7999999999999998"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="1.3999999999999999"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#docente#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes"/>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O27">
+      <dia:attribute name="obj_pos">
+        <dia:point val="2,39"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="1.95,38.95;5.55,40.45"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="2,39"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="3.5"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="1.3999999999999999"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#alumno#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes"/>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O28">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-14,17"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-14.05,16.95;-6.25,22.65"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-14,17"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.7000000000000002"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="5.5999999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#docente_inscripto#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
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+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#*#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O32" connection="9"/>
+        <dia:connection handle="1" to="O15" connection="4"/>
+      </dia:connections>
+    </dia:object>
+  </dia:layer>
+</dia:diagram>

diff --git a/doc/schema/pruebas.dia b/doc/schema/pruebas.dia
new file mode 100644 (file)
index 0000000..8527e83
--- /dev/null
+++ b/doc/schema/pruebas.dia
@@ -0,0 +1,1242 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<dia:diagram xmlns:dia="http://www.lysator.liu.se/~alla/dia/">
+  <dia:diagramdata>
+    <dia:attribute name="background">
+      <dia:color val="#ffffff"/>
+    </dia:attribute>
+    <dia:attribute name="pagebreak">
+      <dia:color val="#000099"/>
+    </dia:attribute>
+    <dia:attribute name="paper">
+      <dia:composite type="paper">
+        <dia:attribute name="name">
+          <dia:string>#A4#</dia:string>
+        </dia:attribute>
+        <dia:attribute name="tmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="bmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="lmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="rmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="is_portrait">
+          <dia:boolean val="false"/>
+        </dia:attribute>
+        <dia:attribute name="scaling">
+          <dia:real val="0.46171978116035461"/>
+        </dia:attribute>
+        <dia:attribute name="fitto">
+          <dia:boolean val="true"/>
+        </dia:attribute>
+        <dia:attribute name="fitwidth">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:attribute name="fitheight">
+          <dia:int val="1"/>
+        </dia:attribute>
+      </dia:composite>
+    </dia:attribute>
+    <dia:attribute name="grid">
+      <dia:composite type="grid">
+        <dia:attribute name="width_x">
+          <dia:real val="1"/>
+        </dia:attribute>
+        <dia:attribute name="width_y">
+          <dia:real val="1"/>
+        </dia:attribute>
+        <dia:attribute name="visible_x">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:attribute name="visible_y">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:composite type="color"/>
+      </dia:composite>
+    </dia:attribute>
+    <dia:attribute name="color">
+      <dia:color val="#d8e5e5"/>
+    </dia:attribute>
+    <dia:attribute name="guides">
+      <dia:composite type="guides">
+        <dia:attribute name="hguides"/>
+        <dia:attribute name="vguides"/>
+      </dia:composite>
+    </dia:attribute>
+  </dia:diagramdata>
+  <dia:layer name="Fondo" visible="true">
+    <dia:object type="UML - LargePackage" version="0" id="O0">
+      <dia:attribute name="obj_pos">
+        <dia:point val="2,2"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="1.95,0.95;54.05,34.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="2,2"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="52"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="32"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#Tareas#</dia:string>
+      </dia:attribute>
+    </dia:object>
+    <dia:object type="UML - LargePackage" version="0" id="O1">
+      <dia:attribute name="obj_pos">
+        <dia:point val="3,10"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="2.95,8.95;29.05,14.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="3,10"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="26"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="4"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#DetectarCopias#</dia:string>
+      </dia:attribute>
+    </dia:object>
+    <dia:object type="UML - LargePackage" version="0" id="O2">
+      <dia:attribute name="obj_pos">
+        <dia:point val="3,16"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="2.95,14.95;29.05,20.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="3,16"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="26"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="4"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#Compilar#</dia:string>
+      </dia:attribute>
+    </dia:object>
+    <dia:object type="UML - LargePackage" version="0" id="O3">
+      <dia:attribute name="obj_pos">
+        <dia:point val="3,4"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="2.95,2.95;29.05,8.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="3,4"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="26"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="4"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#Preparar#</dia:string>
+      </dia:attribute>
+    </dia:object>
+    <dia:object type="UML - LargePackage" version="0" id="O4">
+      <dia:attribute name="obj_pos">
+        <dia:point val="3,22"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="2.95,20.95;48.05,33.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="3,22"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="45"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="11"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#Probar#</dia:string>
+      </dia:attribute>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O5">
+      <dia:attribute name="obj_pos">
+        <dia:point val="9.79794,25.7"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="9.74794,25;15.05,26.6"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="9.79794,25.7"/>
+        <dia:point val="12.5602,25.7"/>
+        <dia:point val="12.5602,25.7"/>
+        <dia:point val="15,25.7"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#0..1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#*#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O9" connection="8"/>
+        <dia:connection handle="1" to="O11" connection="10"/>
+      </dia:connections>
+      <dia:childnode parent="O4"/>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O6">
+      <dia:attribute name="obj_pos">
+        <dia:point val="27,27.5"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="22.8,23;27.05,28.4"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="27,27.5"/>
+        <dia:point val="24.925,27.5"/>
+        <dia:point val="24.925,23.7"/>
+        <dia:point val="22.85,23.7"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#* #</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># 1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O10" connection="12"/>
+        <dia:connection handle="1" to="O11" connection="4"/>
+      </dia:connections>
+      <dia:childnode parent="O4"/>
+    </dia:object>
+    <dia:object type="UML - Association" version="1" id="O7">
+      <dia:attribute name="obj_pos">
+        <dia:point val="35.9,26.7"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="35.9,26;40.0203,27.6"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="35.9,26.7"/>
+        <dia:point val="35.9,26.7"/>
+        <dia:point val="39.9496,26.7"/>
+        <dia:point val="39.9496,26.7"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string># *#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#1 #</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O10" connection="11"/>
+        <dia:connection handle="1" to="O8" connection="8"/>
+      </dia:connections>
+      <dia:childnode parent="O4"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O8">
+      <dia:attribute name="obj_pos">
+        <dia:point val="40,26"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="39.95,25.95;47.15,27.45"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="40,26"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.0999999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="1.3999999999999999"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#tarea_ejecutada#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes"/>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O4"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O9">
+      <dia:attribute name="obj_pos">
+        <dia:point val="5,25"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="4.95,24.95;9.8,26.45"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="5,25"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="4.75"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="1.3999999999999999"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#enunciado#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes"/>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O4"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O10">
+      <dia:attribute name="obj_pos">
+        <dia:point val="27,24"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="26.95,23.95;35.95,31.25"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="27,24"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="8.9000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="7.1999999999999993"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#prueba#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#ejecucion_tarea_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#caso_de_prueba_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#inicio#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#fin#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#pasada#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#observaciones#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#TEXT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O4"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O11">
+      <dia:attribute name="obj_pos">
+        <dia:point val="15,23"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="14.95,22.95;22.9,31.85"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="15,23"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.8499999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="8.7999999999999989"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#caso_de_prueba#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#enunciado_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>#Si es NULL son casos de prueba generales.#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#nombre#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#privado#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#activo#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#parametros#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#codigo_retorno#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#tiempo_cpu#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#FLOAT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#descripcion#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O4"/>
+    </dia:object>
+  </dia:layer>
+</dia:diagram>

diff --git a/doc/schema/tareas.dia b/doc/schema/tareas.dia
new file mode 100644 (file)
index 0000000..181ace0
--- /dev/null
+++ b/doc/schema/tareas.dia
@@ -0,0 +1,1978 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<dia:diagram xmlns:dia="http://www.lysator.liu.se/~alla/dia/">
+  <dia:diagramdata>
+    <dia:attribute name="background">
+      <dia:color val="#ffffff"/>
+    </dia:attribute>
+    <dia:attribute name="pagebreak">
+      <dia:color val="#000099"/>
+    </dia:attribute>
+    <dia:attribute name="paper">
+      <dia:composite type="paper">
+        <dia:attribute name="name">
+          <dia:string>#A4#</dia:string>
+        </dia:attribute>
+        <dia:attribute name="tmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="bmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="lmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="rmargin">
+          <dia:real val="2.8222000598907471"/>
+        </dia:attribute>
+        <dia:attribute name="is_portrait">
+          <dia:boolean val="false"/>
+        </dia:attribute>
+        <dia:attribute name="scaling">
+          <dia:real val="0.72675526142120361"/>
+        </dia:attribute>
+        <dia:attribute name="fitto">
+          <dia:boolean val="true"/>
+        </dia:attribute>
+        <dia:attribute name="fitwidth">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:attribute name="fitheight">
+          <dia:int val="1"/>
+        </dia:attribute>
+      </dia:composite>
+    </dia:attribute>
+    <dia:attribute name="grid">
+      <dia:composite type="grid">
+        <dia:attribute name="width_x">
+          <dia:real val="1"/>
+        </dia:attribute>
+        <dia:attribute name="width_y">
+          <dia:real val="1"/>
+        </dia:attribute>
+        <dia:attribute name="visible_x">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:attribute name="visible_y">
+          <dia:int val="1"/>
+        </dia:attribute>
+        <dia:composite type="color"/>
+      </dia:composite>
+    </dia:attribute>
+    <dia:attribute name="color">
+      <dia:color val="#d8e5e5"/>
+    </dia:attribute>
+    <dia:attribute name="guides">
+      <dia:composite type="guides">
+        <dia:attribute name="hguides"/>
+        <dia:attribute name="vguides"/>
+      </dia:composite>
+    </dia:attribute>
+  </dia:diagramdata>
+  <dia:layer name="Fondo" visible="true">
+    <dia:object type="UML - LargePackage" version="0" id="O0">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-18,-4"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-18.05,-5.05;15.05,16.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-18,-4"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="33"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="20"/>
+      </dia:attribute>
+      <dia:attribute name="line_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_colour">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_colour">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#Tareas#</dia:string>
+      </dia:attribute>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O1">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-6,-3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-6.05,-3.05;3.2,-1.55"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-6,-3"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="9.1500000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="1.3999999999999999"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#instancia_de_entrega#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes"/>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O2">
+      <dia:attribute name="obj_pos">
+        <dia:point val="10,9"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="9.95,8.95;13.75,10.45"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="10,9"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="3.7000000000000002"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="1.3999999999999999"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#entrega#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes"/>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O3">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-15,-3"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-15.05,-3.05;-10.2,-1.55"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-15,-3"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="4.75"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="1.3999999999999999"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#enunciado#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes"/>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O4">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-11,6"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-11.05,5.95;-3.1,10.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-11,6"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="7.8499999999999996"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="4"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#tarea#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#nombre#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#descripcion#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#VARCHAR#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+    <dia:object type="UML - Class" version="0" id="O5">
+      <dia:attribute name="obj_pos">
+        <dia:point val="-16,11"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-16.05,10.95;-10.15,15.05"/>
+      </dia:attribute>
+      <dia:attribute name="elem_corner">
+        <dia:point val="-16,11"/>
+      </dia:attribute>
+      <dia:attribute name="elem_width">
+        <dia:real val="5.7999999999999998"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="4"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#dependencia#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
+      </dia:attribute>
+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#padre_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#hijo_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#orden#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#FLOAT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
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+        <dia:point val="-16,12.9"/>
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+        <dia:point val="-17,12.9"/>
+        <dia:point val="-17,6.7"/>
+        <dia:point val="-11,6.7"/>
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+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
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+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#*#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
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+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
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+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
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+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
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+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
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+        </dia:composite>
+      </dia:attribute>
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+        <dia:connection handle="0" to="O5" connection="8"/>
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+        <dia:point val="-10.2,13.7"/>
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+        <dia:rectangle val="-10.25,9.95;-6.525,14.6"/>
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+        <dia:point val="-10.2,13.7"/>
+        <dia:point val="-7.075,13.7"/>
+        <dia:point val="-7.075,10"/>
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+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#*#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
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+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
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+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
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+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
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+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
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+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
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+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
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+        <dia:point val="-16,0"/>
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+        <dia:rectangle val="-16.05,-0.05;-8.7,4.05"/>
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+      <dia:attribute name="elem_corner">
+        <dia:point val="-16,0"/>
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+      <dia:attribute name="elem_width">
+        <dia:real val="7.25"/>
+      </dia:attribute>
+      <dia:attribute name="elem_height">
+        <dia:real val="4"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>#enunciado_tarea#</dia:string>
+      </dia:attribute>
+      <dia:attribute name="stereotype">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="comment">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="abstract">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="suppress_attributes">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="suppress_operations">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="visible_attributes">
+        <dia:boolean val="true"/>
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+      <dia:attribute name="visible_operations">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="visible_comments">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="wrap_operations">
+        <dia:boolean val="true"/>
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+      <dia:attribute name="wrap_after_char">
+        <dia:int val="40"/>
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+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
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+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
+      </dia:attribute>
+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
+      </dia:attribute>
+      <dia:attribute name="normal_font_height">
+        <dia:real val="0.80000000000000004"/>
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+      <dia:attribute name="polymorphic_font_height">
+        <dia:real val="0.80000000000000004"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_font_height">
+        <dia:real val="0.80000000000000004"/>
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+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#enunciado_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
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+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#tarea_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
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+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
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+          <dia:attribute name="class_scope">
+            <dia:boolean val="true"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#orden#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#FLOAT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
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+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
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+      <dia:childnode parent="O0"/>
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+        <dia:point val="-8.75,2.7"/>
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+        <dia:rectangle val="-8.8,2;-6.525,6.8"/>
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+        <dia:point val="-8.75,2.7"/>
+        <dia:point val="-7.075,2.7"/>
+        <dia:point val="-7.075,6"/>
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+        <dia:enum val="0"/>
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+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
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+      <dia:attribute name="name">
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+        <dia:enum val="0"/>
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+      <dia:attribute name="ends">
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+          <dia:attribute name="multiplicity">
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+          <dia:attribute name="arrow">
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+          <dia:attribute name="role">
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+      <dia:attribute name="comment">
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+        <dia:color val="#000000"/>
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+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
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+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
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+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
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+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
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+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
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+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
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+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
+      </dia:attribute>
+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#tarea_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#entrega_id#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
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+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="2"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#inicio#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#fin#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#DATE#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#exito#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#BOOL#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
+          </dia:attribute>
+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
+            <dia:string>#observaciones#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#TEXT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="comment">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="3"/>
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+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
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+          <dia:attribute name="class_scope">
+            <dia:boolean val="false"/>
+          </dia:attribute>
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+      <dia:attribute name="operations"/>
+      <dia:attribute name="template">
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+      <dia:attribute name="templates"/>
+      <dia:childnode parent="O0"/>
+    </dia:object>
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+        <dia:point val="7.5,9.7"/>
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+        <dia:rectangle val="7.5,9;10.0202,10.6"/>
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+        <dia:point val="7.5,9.7"/>
+        <dia:point val="7.5,9.7"/>
+        <dia:point val="9.94954,9.7"/>
+        <dia:point val="9.94954,9.7"/>
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+        <dia:enum val="1"/>
+        <dia:enum val="0"/>
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+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
+      </dia:attribute>
+      <dia:attribute name="name">
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+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
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+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
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+          <dia:attribute name="multiplicity">
+            <dia:string>#*#</dia:string>
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+          <dia:attribute name="arrow">
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+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
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+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
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+          <dia:attribute name="arrow">
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+      <dia:attribute name="autorouting">
+        <dia:boolean val="true"/>
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+      <dia:attribute name="name">
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+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
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+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
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+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
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+          <dia:attribute name="arrow">
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+            <dia:enum val="0"/>
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+      <dia:attribute name="text">
+        <dia:composite type="text">
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+# es PK lógica
+- es para
+  polimorfismo#</dia:string>
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+          <dia:attribute name="font">
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+      <dia:attribute name="autorouting">
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+      <dia:attribute name="name">
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+        <dia:enum val="0"/>
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+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
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+          <dia:attribute name="arrow">
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+            <dia:string>#1#</dia:string>
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+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
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+        <dia:point val="-5,0"/>
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+        <dia:real val="6.7999999999999998"/>
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+      <dia:attribute name="elem_height">
+        <dia:real val="4"/>
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+      <dia:attribute name="name">
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+      </dia:attribute>
+      <dia:attribute name="stereotype">
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+      </dia:attribute>
+      <dia:attribute name="comment">
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+        <dia:boolean val="false"/>
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+      <dia:attribute name="comment_line_length">
+        <dia:int val="40"/>
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+      <dia:attribute name="comment_tagging">
+        <dia:boolean val="false"/>
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+      <dia:attribute name="line_color">
+        <dia:color val="#000000"/>
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+      <dia:attribute name="fill_color">
+        <dia:color val="#ffffff"/>
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+      <dia:attribute name="text_color">
+        <dia:color val="#000000"/>
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+      <dia:attribute name="normal_font">
+        <dia:font family="monospace" style="0" name="Courier"/>
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+      <dia:attribute name="abstract_font">
+        <dia:font family="monospace" style="88" name="Courier-BoldOblique"/>
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+      <dia:attribute name="polymorphic_font">
+        <dia:font family="monospace" style="8" name="Courier-Oblique"/>
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+      <dia:attribute name="classname_font">
+        <dia:font family="sans" style="80" name="Helvetica-Bold"/>
+      </dia:attribute>
+      <dia:attribute name="abstract_classname_font">
+        <dia:font family="sans" style="88" name="Helvetica-BoldOblique"/>
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+      <dia:attribute name="comment_font">
+        <dia:font family="sans" style="8" name="Helvetica-Oblique"/>
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+        <dia:real val="0.80000000000000004"/>
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+      <dia:attribute name="classname_font_height">
+        <dia:real val="1"/>
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+        <dia:real val="1"/>
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+      <dia:attribute name="comment_font_height">
+        <dia:real val="1"/>
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+      <dia:attribute name="attributes">
+        <dia:composite type="umlattribute">
+          <dia:attribute name="name">
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+          </dia:attribute>
+          <dia:attribute name="type">
+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
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+          <dia:attribute name="comment">
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+            <dia:string>#INT#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="value">
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+          </dia:attribute>
+          <dia:attribute name="comment">
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+            <dia:enum val="2"/>
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+          <dia:attribute name="abstract">
+            <dia:boolean val="false"/>
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+      <dia:attribute name="obj_pos">
+        <dia:point val="-5,2.7"/>
+      </dia:attribute>
+      <dia:attribute name="obj_bb">
+        <dia:rectangle val="-7.125,2;-4.95,6.8"/>
+      </dia:attribute>
+      <dia:attribute name="orth_points">
+        <dia:point val="-5,2.7"/>
+        <dia:point val="-7.075,2.7"/>
+        <dia:point val="-7.075,6"/>
+      </dia:attribute>
+      <dia:attribute name="orth_orient">
+        <dia:enum val="0"/>
+        <dia:enum val="1"/>
+      </dia:attribute>
+      <dia:attribute name="autorouting">
+        <dia:boolean val="false"/>
+      </dia:attribute>
+      <dia:attribute name="name">
+        <dia:string>##</dia:string>
+      </dia:attribute>
+      <dia:attribute name="direction">
+        <dia:enum val="0"/>
+      </dia:attribute>
+      <dia:attribute name="ends">
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#*#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+        <dia:composite>
+          <dia:attribute name="role">
+            <dia:string>##</dia:string>
+          </dia:attribute>
+          <dia:attribute name="multiplicity">
+            <dia:string>#1#</dia:string>
+          </dia:attribute>
+          <dia:attribute name="arrow">
+            <dia:boolean val="false"/>
+          </dia:attribute>
+          <dia:attribute name="aggregate">
+            <dia:enum val="0"/>
+          </dia:attribute>
+          <dia:attribute name="visibility">
+            <dia:enum val="0"/>
+          </dia:attribute>
+        </dia:composite>
+      </dia:attribute>
+      <dia:connections>
+        <dia:connection handle="0" to="O15" connection="10"/>
+        <dia:connection handle="1" to="O4" connection="1"/>
+      </dia:connections>
+      <dia:childnode parent="O0"/>
+    </dia:object>
+  </dia:layer>
+</dia:diagram>