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Section 4.2.2.1 states: "When {variety} is union, if {value} is true for every member of {member type definitions} and all members of {member type definitions} share a common ancestor, then {value} is true; else {value} is false." But, {value} can be "partial" or "total" but not "true". See http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001AprJun/0210.html
An erratum was added to correct this text.