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F.1.1 rightly disallows \p{Cs} on the basis that surrogate characters "do not occur at the level of the "character abstraction" that XML instance documents operate on." On the same basis, shouldn't IsHighSurrogates, IsHighPrivateUseSurrogates and IsLowSurrogates also be disallowed within \p{} and \P{}? See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2002AprJun/0008.html
Resolved at the May f2f to classify this as an error, instructing the editors to draft erratum reflecting changes suggested by commentator. Proposed text: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Oct/0232.html Reviewed and approved, with ammendments, at Oct. 24 telecon. Erratum E2-38 added.