comma (or space) delimited list of tags for each member of the address
tuple. So, if you wanted to subscribe to LINK and TIME events, you
would set the address tuple like this:

	tuple->objtype   = "TRAFGEN,TIME";

and the subscription clause that would be passed to elvin would look
something like this:

	( OBJTYPE == "TRAFGEN" || OBJTYPE == "TIME" )

This should make it easier to subscribe to multiple types of events,
without having to get all of them. For example, the trafgen agent
could subscribe to TIME events and get the TIME START event that is
now sent once all nodes report ISUP