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The Datatypes spec states: "A datatype is bounded if its value space has either an inclusive upper bound or an exclusive upper bound and either an inclusive lower bound and an exclusive lower bound." Shouldn't the last "and" be "or"? See http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001AprJun/0091.html
An erratum E2-3 was added that reflects the proposed change.