XML XSD or DTD describing PeopleSoft Integration Gateway Messages

My current project will be receiving XML messages sent from the PeopleSoft Integration Gateway. I am looking for XML schema or XML doctypes (DTD’s) that describe the generic structure of these messages (fieldtypes, PSCAMA, msgdata and transaction elements, specifically).

The samples included with version 6.0 of the PSFT adapter are embarrassingly weak and don’t contain any IS doc types.

Before I whip up some new schemas in XML Spy, I thought I would see if any wMUsers members had anything that would help.