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These are described using XML Schema. If XML module will implement issue #26477 then we get it automatically otherwise we need to plugin own ...xml.api.GrammarQueryProvider (see ...xsl.grammar or ...xml.dtd.grammar packages for examples).
Issue #26841 is required for proper issue #26477 functionality with J2EE descriptors.
Regarding local XMLSchema caching, web modules can use JAXP 1.1 directly as it has apriory knowledge of used namespaces and it bundles patricular schemas with module itself. Issue 26841 descheduled.
Implemented for Nb40.