Embedding RDF in HTML

Hi,
I have been parsing all annotated abstracts of ISWC
http://annotation.semanticweb.org/iswc/documents.html into a graphical
model http://www.semtalk.com/pub/sardinia.htm. A couple of people have
seen it.
 
One problem I had was, that nearly nobody was using XHTML. The
consequence is that all RDF/DAML annotations have been embedded into
plain html and all character encodings got lost. 
My question is whether there is (or might be in future) a standard way
how to reference from an arbitrary html document to an external
(xml-based) page storing the rdf annotation to avoid this problem. 
 
/Christian