Lars, yeah, it would propigate the entry_id for a blog or
the message_id for a forum thread (or single post), the user_id for community_member page, etc.
For multiple items if you wanted to service-y things
you would need a service contract (or do
the tcl function namespace trick) so this does not address that really.
Dave, I had not really thought about using a namespace variable for it. I guess that would work too although using a property seems to be more in keeping with tradition.
I think using the property object_id is actually bad, and it
should probably be "displayed_object" or something like that.