Class used to identify an Object in an Database when the object is references via a path of BlockReferences, and possibly by some other ways in the future. The object may reside in the host database (the same database as the CompoundObjectId belongs to) or it may reside in an XREF database or even in an unrelated database. 

Notice that if the CompoundObjectId references an object in another database, reactors will be created to keep tract of relevant events happening to the database, such as database deletion or XREF unload/reload.

Autodesk.AutoCAD.DatabaseServices.CompoundObjectId

Public Class CompoundObjectId
Inherits RXObject

public class CompoundObjectId : RXObject;