DDS12 — Make the ObjectFilter and the ObjectQuery separate Selection Criterions

Summary:

In the current specification, the ObjectQuery inherits from the ObjectFilter, making it an ObjectFilter as well. That means that performing Queries can no longer be delegated to the DCPS, since the Selection invokes the check_object method on the ObjectFilter for that purpose.

Proposed Resolution:

Make the ObjectFilter and the ObjectQuery to separate classes with a common parent called SelectionCriterion. A SelectionCriterion can be then be attached to a Selection, which will either invoke the check_object method in case of a Filter, or delegate the Query to DCPS in case of a Query.

see above