Just passing along info I got from someone else. I'll have to track down the rest of the documentation, but in essence you need to adjust the wsdl file to point to the full path of the xsd files. Below is the note..
C:\VMware-vSphere-SDK-5.1.0-774886\SDK\vsphere-ws\wsdl\vim25\query-messagetypes.xsd
In the original file it’s just “query-messagetypes.xsd”, so you need to replace all path that include files with “.xsd” extension. And in the Workflow you need to select “vimService” instead of “vim” file.