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There doesn't appear to be anything in the REC which blocks a simple type definition of {variety} 'list' whose {item type definition} is not derived from its {base type definition}'s {item type definition}. The same is true for {variety} 'union' and {member type definitions}. See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001OctDec/0137.html
Resolved at the March 14 telecon to classify R-102 as an error with erratum and to instruct HST, PVB, AM to prepare erratum text (the text will apply to Structures, but the Datatypes editors have a strong interest here). Proposed text at: http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Oct/att-0221/00-R- 67etc.html Discussed and approved at Oct. 24 telecon http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2002Oct/0248.html Erratum E1-24 added