updated: RDF/XML Media Type registration draft

I've updated the draft to reflect all the comments I've received. Here  
are the changes I've made:

1. Changed type to be "rdf " so as to be consistent with the syntax doc.

2. Deleted section on social meaning.

3. Refers to Concepts instead of Model Theory.

4. Added paragraph to interoperability considerations:
     RDF is intended to allow common information to be exchanged between
     disparate applications.  A basis for building common understanding  
is
     provided by <xref target="W3C.rdf-mt">a formal semantics</xref>, and
     applications that use RDF should do so in ways that are consistent  
with this.

5. Added paragraph to section on Fragment Identifiers:
     More details on RDF's view of fragment identifiers can be found in  
the
     section "Fragment Identifiers" of <xref  
target="W3C.rdf-concepts">the
     RDF Concepts document</xref>.

The updated version is available at:
http://www.aaronsw.com/2002/draft-swartz-rdfcore-rdfxml-mediatype 
-03.html

Unless there are any objections, I plan to submit it as an updated  
Internet-Draft. We'll probably do this again after the RDF specs go to  
REC. Thanks for all your help.
-- 
Aaron Swartz: http://www.aaronsw.com/