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There's a typo in the second example in 2.8 Attribute Groups <xsd:attributeGroup id="ItemDelivery"> should be <xsd:attributeGroup name="ItemDelivery">
A similar error from the xml-schema-comments list: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2008JulSep/0067.html Errata <xsd:group id="shipAndBill"> Corrige <xsd:group name="shipAndBill">