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Reported by Björn Höhrmann: "The Validator is documented as using OpenSP for validation. OpenSP 1.4's onsgmls does not know about the -R switch the check script uses in @xmlflags."
Marking this "blocker" as we really need to have an OpenSP with "-R" support available before final release.
Updated list of prerequisites, including OpenSP-1.5pre9 (which was just released).