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Some of our local colleagues here at Argonne are using XML for a project not completely unlike ours. Having explored some of the large space of XML tools, they recommend (and are using) two: An editor for schemas: www.omniopera.com An editor for XML that validates against a schema: www.editml.com (Yes, it would nice to have only one tool that does both.) Narayan and I have not started using these yet, but intend to in our next round of revising our API's. So these don't come personally recommended yet, but Bob Olson and Terry Disz usually have sound opinions.