Since W3C XML Schema very frequently exhibits interoperability problems, it is not safe to use it as the only normative schema language.
Use both RELAX NG and W3C XML Schema normatively.
Part 4 Annex B and Part 2 Annex E
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Proposed Disposition of DIS 29500 Comment JP-0071 (Modified: 2008-01-04) Agree; we will update the W3C XML schema files to ensure that there are no interoperability problems. This was handled in the response to ECMA-0013; GB-0621; JP-0002. With that change, there should be no need to make the RELAX NG schemas normative as the W3C XML schemas will work.
