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In Appendix E of http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/#component- diagram in the Element declaration rectangle,"substitution group affliation" should be "substitution group affiliation". An "i" is missing. See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001JulSep/0221.html