XML Schema validation in tcl

Hi,
We need to validate an XML file against a set of xsd files in Tcl. We
got some code to validate some types in schema like xs:element but not
for types like xs:any, xs:unique, xs:filed, xs:key, xs:choice,
xs:union, xs:all, xs:anyAttribute, xs:keyRef, xs:selector.

Our problem is we are unable to find some simple xml-xsd pairs to test
any code that we write.We searched in w3schools and filigris sites but
did not find any examples except for related theory. please let us
know of any other sources for the same

Rgds
GSA

GSA