Newbie; WSDL "unresolved ref" issue

Hi, everyone. I apologize if this is a FAQ; I did browse through the newsgroup archives, but didn't see a mailing list archive. My problem is with consuming a WSDL web service where the WSDL was generated by Microsoft's SQLXML SOAP thingy. I'm working with PHP5 and the native SoapClient, and getting the error "SOAP-ERROR: Parsing Schema: unresolved element 'ref' attribute" You can see the WSDL itself at http://67.125.166.237/soap/test?wsdl . The method I'm trying to call is "echo", but this error happens immediately upon calling the SoapClient constructor. Of course, there are quite a few ref's in that there WSDL, and it's unclear which one(s) are causing the trouble. So on a side note, can I suggest that the error message be amended to say *which* element ref attribute was unresolved? Anyways, I'd love any ideas or assistance. I've got an entirely different issue trying to use the low level __call approach, but I'd probably prefer to get it going the real WSDL way than fight with that, so I'll leave that for now. Cheers -Brooks