namespace question

Hi,
i'm currently experimenting with xhtml 1.1. The testpage at 
http://www.rorkvell.de/tmp.xhtml.de validated until i included rdf metadata. 
All errors reported by the validator have something to do with the namespaces 
used and/or the rdf tags.

So my question is: Is that indeed wrong how i did that? If so, how to do that 
correct? Or is it a bug or limitation to the validator? 

Firefox renders the page correct :)

Thanks in advance
Siegfried Gipp


-- 
public gpg key at http://www.rorkvell.de/siegfried.asc