Here's an updated version of the example supporting the interface-based XSD (Paella) proposal from Barcelona. See the readme.txt for details. Essentially this is a proposal for how to use various features of XSD to effect specialization of UBL types (and specializations of those types...) This is about one baby-step away from being a full-fledged position paper IMO. About all that has to happen now is to take the readme.txt and couple it with the pros and cons list from the minutes. Adios, Bill PS For those of you with XML Spy, there's a Spy project (.spp) included. Attachment: interface based XSD - 1.zip Description: Binary data