Added effectiveBooleanValueWithError: method to GTWTerm classes.
Improved support for recognizing and handling more XSD numeric types.
Added GTWStatement protocol.
Added reason argument to GTWGraphIsomorphism graphEnumerator:isomorphicWith:reason: method.
Improved error messages.
Added GTWModelBase methods subjectsForPredicate:object:graph: and anySubjectForPredicate:object:graph:.