AcRxObject AcDbObjectContextCollection
class AcDbObjectContextCollection : public AcRxObject;
dbObjectContextCollection.h
An interface to an application-defined collection of AcDbObjectContext objects.
Applications implement this interface to define custom object contexts for their context-sensitive objects. Applications must instantiate an instance of the collection (typically one instance for each database) and register it with the AcDbObjectContextCollectionManager for each AcDbDatabase which needs to support the context type. Each context collection has a state; this is represented by the collection of contexts, the "current" context, and the ability to lock or unlock context instances.