Attribute Invalidation Rule

The Match POC had a concept of attribute invalidation, where a canonical match could be converted to a potential match if the specified attribute did not match.

For example, if a set of attributes is configured to be a canonical match on name and SSN, and name and SSN exactly match, but date of birth is configured to invalidate and the requested date of birth does not match the candidate record, then the candidate will drop to a potential match even though name and SSN would otherwise be a canonical match.

This concept may still be useful, but it's not clear if it was sufficiently generalized. eg: Perhaps there should be a third rule type, to define invalidation. Probably need a use case to move this forward.