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In the example in section 3.4.2 of Structures, the references to types "xs:nonPositiveInteger" and "xs:non-positive-integer" should both be "xs:nonNegativeInteger". See http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001AprJun/0219.html
An erratum E1-1 was added to correct this.