How can we use hash URIs to serve both the document and the RDFa triples?

Let us say we have a document at http://example.org/document.html, and that
document also contains meta data describing it embedded via RDFa.

Can we refer to the meta data triples in the document with a URI like
http://example.org/document.html#about ?

How can we serve a different presentation to the browser depending on which
URI is requested from the server?

-- 
Seth Russell
Ruminations regarding the New Semantic Web
http://fastblogit.com/permalink/?item=12210
www.speaktomecatalog.com