+ <dia:object type="UML - Association" version="0" id="O39">
+ <dia:attribute name="obj_pos">
+ <dia:point val="6.925,16.55"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="-0.875,15.8;7.275,24.85"/>
+ </dia:attribute>
+ <dia:attribute name="orth_points">
+ <dia:point val="6.925,16.55"/>
+ <dia:point val="5.925,16.55"/>
+ <dia:point val="5.925,23.45"/>
+ <dia:point val="-0.825,23.45"/>
+ <dia:point val="-0.825,22.45"/>
+ </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="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: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:composite>
+ </dia:attribute>
+ <dia:connections>
+ <dia:connection handle="0" to="O7" connection="28"/>
+ <dia:connection handle="1" to="O3" connection="6"/>
+ </dia:connections>
+ </dia:object>
+ <dia:object type="UML - Note" version="0" id="O40">
+ <dia:attribute name="obj_pos">
+ <dia:point val="45.0501,-1.365"/>
+ </dia:attribute>
+ <dia:attribute name="obj_bb">
+ <dia:rectangle val="45.0001,-1.415;58.9001,5.985"/>
+ </dia:attribute>
+ <dia:attribute name="elem_corner">
+ <dia:point val="45.0501,-1.365"/>
+ </dia:attribute>
+ <dia:attribute name="elem_width">
+ <dia:real val="13.800000000000001"/>
+ </dia:attribute>
+ <dia:attribute name="elem_height">
+ <dia:real val="7.3000000000000007"/>
+ </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>#Las claves primarias naturales se
+representan con un # (el conjunto de
+atributos marcados con # en una tabla
+componen la clave primaria natural).
+Cada tabla tiene un indice compuesto
+por estos atributos.
+Para mejor legibilidad, a las PK las
+antecede un signo + y las FK un -.#</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="45.4001,-0.115"/>
+ </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:object>