Method: CONSTRUCTOR
Method: MAKE_PROCEDURES
Method: FIND_OR_INSERT_PROC
Method: PO_FIND_OR_INSERT_SINGLETON
Method: MAKE_CONJUNCTION
Method: GET_KNOWLEDGE_EXTERNAL
Method: FIND_OR_INSERT_CONJUNCTION
Method: FIND_OR_INST_SINGLETON
Method: GET_PROCEDURE_EXTERNAL
Method: GET_SEL_COND_EXTERNAL
Method: ADD_PROCEDURE_TAB
Method: ADD_PROCEDURE
Method: GET_SELNET_DATA