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All schema components have an id attribute, but the two children of annotation (appinfo and documentation) haven't. Why? See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2003JanMar/0075.html
Discussed at 2005-10-28 telecon [1]. Resolved: Classify as error with corrigendum: Add id to appinfo and documentation by hand in SD4D. [1] http://lists.w3.org/Archives/Member/w3c-xml-schema-ig/2005Oct/0022.html