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The elt derived from choice case of particle restriction checking rules out the derivation of the type of <xs:all> from <xs:explicitGroup> in the Schema for Schemas. See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001JulSep/0172.html
The WG resolved that the Schema for Schemas is in error; Henry Thompson to prepare an erratum. Proposed text at: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Apr/0074.html Errata approved at May 2 concall. Errata added as E1-8
The corresponding erratum should be E1-7.