12. The apparatus set forth in claim 11 wherein: the operation of adding any entities includes the operation of using the provided compositional description to determine whether there is an inconsistency between the entities being added and the knowledge base prior to adding the entities.
12. The apparatus set forth in claim 11 wherein: the operation of adding any entities includes the operation of using the provided compositional description to determine whether there is an inconsistency between the entities being added and the knowledge base prior to adding the entities. 13. The apparatus set forth in claim 12 wherein: the operation of using the provided compositional description to determine inconsistencies includes the operations of providing a compositional description derived from the provided compositional description to the translation means and determining from the answer to the data base query made by the translation means in response to the derived compositional description whether there is an inconsistency.