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According to the recent discussion about list of IDs, maybe the intention was that only restriction should be considered for these types. This might be OK for ID/IDREF, but it'd be a behavior change for ENTITY/ENTITIES types. (The current wording in the datatype spec indicates that lists/unions of ENTITY are also considered as values of type ENTITY.) See: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2003Jan/0009.html
Discussed and resolved at the May 23, 2003 telecon. RESOLVED: direct TF to classify R-200 as error with erratum. RESOLVED: direct editors to correct the error by covering the list and union cases in the obvious may.