+ uchar *ReadBlock (uint num);
+
+ void ReadNodoHeader (uchar *node, BTreeNodeHeader *header);
+ void WriteNodoHeader (uchar *node, BTreeNodeHeader *header);
+
+ std::list<Clave *> ReadKeys (uchar *node, BTreeNodeHeader &node_header);
+ void WriteKeys (uchar *node, BTreeNodeHeader &node_header, std::list<Clave *> &keys);
+