Coordinating XML schema and RDF schema

Dear RDF Community!

At the University of Economics and Business Administration in
Vienna/Austria we
have some open questions about glueing XML Schema and RDF Schema.
1. How can we use vocabulary defined in an XML schema and vocabulary
defined in
an RDF schema to describe a resource within one an xml document. Is a
connection between RDF and XML schema planned? Is it possible, therefore, to
import both the XML schema and the RDF schema as namespaces? Is it possible to
mix RDF and XML to describe resources?
In case a member of the Metadata Coordination Group reads this, we would
appreciate any kind of comment from you. 

2. Is there a way to define wheather a property of a resource is mandatory or
not in RDF?

3. Is it indendet to describe varable types like STRING in RDF?

Thank you very much for your comment
Best Regards


 _________________________________________________________________________
Susanne Guth
Assistant Professor, Vienna University of Economics and Business
Administration
,Department of Information Systems, New Media
susanne.guth@wu-wien.ac.at, http://wwwi.wu-wien.ac.at, +43 1 31336 4427