Mike, looking at your proposal working draft, I don't agree with the DFDL subset you are proposing. I think it is too restrictive. Specifically: 1) xsd:all - we have discussed this as part of the unordered mail exchange last week so I think we now agree this is needed. 2) Single top-level global element, global attributes, element references, attribute references. This prevents re-use. 3) Reusable groups. Ditto. 4) Simple type hexBinary. This is the MRM model's default mapping for binary data. 5) Other simple types. Some of these could be discussed - eg, the date restrictions. 6) Substitution groups. We basically treat these a choice in non-XML data. But I would be ok with deferring support post 1.0. Regards, Steve Steve Hanson WebSphere Business Integration Brokers, IBM Hursley, England Internet: smh@uk.ibm.com Phone (+44)/(0) 1962-815848