Expressing triples with special characters in URLs

Hi,

As far as I do understand the way to express a triple in XML is

<rdf:Description rdf:about="http://www.mydomain.com/my_subject.html">
  <predicates:my-predicate 
     rdf:resource="http://www.mydomain.com/my_object.html"/>
</rdf:Description>

Since characters of XML-Tagnames are more restricted than characters in URLs I
wonder how to express triples where the predicate URL contains special
characters like ':', '&' and '%'? Its not quite common but possible for some
nodes (especially in my application ;-)

Thanks a lot,
  Jakob Voss