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Should be a rather simple DTD since the themes.xml format is very simple. Should live in core/src/org/netbeans/core/resources/nb-theme-1_0.dtd with a copy in www/www/dtds/. Catalog entry in www/www/dtds/catalog and entity decl in core/src/org/netbeans/core/resources/mf-layer.xml:/xml/entities/ as usual. NbTheme.java should run in nonvalidating mode and supply an empty input source for the DTD. All example theme files available should be given a proper DOCTYPE declaration for instructional purposes.
Does themes.xml even still work?