A base class for all item definitions for extensions that track more than existence.
Returns whether the definitions are equal. This version returns true by default, you must override it in your subclasses to make the results relevant. This is important for <NaturalDocs::SourceDB->AnalyzeTrackedFileChanges()>.
This will only be called between objects of the same ExtensionID. If you use multiple derived classes for the same ExtensionID, you will have to take that into account yourself.
Whether they are equal.