Ok, Byrne helped me out with a link to this site:
But this question still worries me:
>> when i receive such a structure from a client, my SOAP::Lite Server
>> comes with a message like this:
>> Application failed during request deserialization: Unrecognized
>> i think this is because the server does not know about the xsd that
>> belongs to the namespace 'urn:catalog' ... how can i tell the
>> where the according xsd is located?