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According to nbdev I should file a RFE requesting that a module writer needs to be able to register a local instance of the schema(s)? This would be used to allow user validations using the xml editor. This should be possible as there are many uses for this including J2EE.
AFAIK it is partially possible; you can register the *possibility* for the user to add the schema from the XML Entity Catalogs node, but not actually preregister it. Still investigating in the context of issue #49976.
It is already possible; see issue #49976 for an example. *** This issue has been marked as a duplicate of 22848 ***
Fixed long time ago