Error when adding a web service as a datasource

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I get an error which has more information than what I am posting, but this
seems to be the meat of it

undeclared xsd element

This occurs after I select the web service, type in the url, choose the
method (MyQueryService). This error then pops up. I am definately a
newbie, so any thoughts would be appreciated.

Secondly, I recieved a response from a earlier post that said to look at
DocLiteral. I can't seem to find anything about this anywhere.

Shaun