No such exist, to my knowledge.
>So, is there any paper or soon-to-be-written paper that addresses the
>relative scope of these efforts?
Several of these are about to be rolled together into RDF. There is
a big RDF meeting tomorrow and Thursday in Seattle at which this
process gets going.
For those who are W3C members, check out
http://www.w3.org/Metadata/RDF/Group/9708/27Agenda.html
-Tim