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Micah Dubinko wrote: > > > Since there are multiple versions of some vocabularies that can't be > distinguished by the namespace, only by the DOCTYPE, something like this > would help processors figure out what to do. If this is an accurate statement of the problem, then I think that there are solutions out there. There are three separate issues: * multiple "related" namespaces * multiple versions of a namespace * multiple schemas for a single logical namespace If you model your versions as different namespaces altogether, then you have no problem, just use different namespace declarations. If you want to have a concept of multiple versions, then you could add a "version" attribute to your namespace and figure out what version you're dealing with through that. If you want a single namespace and multiple schemas (whether for versioning or otherwise), you can use the XML Schema SchemaLocation attribute...or equivalent for other schema languages that have such a concept. The current concensus view is that document types/vocabularies are distinct from schemas. The DOCTYPE declaration conflated them in a way that was harmful. Paul Prescod
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