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In my opinion test 'particlesK006' of set 'MS-Particles2006-07-15' should be valid for XSD 1.1. This testcase restricts: <xsd:all minOccurs="0"> <xsd:element name="a0" minOccurs="0"/> <xsd:element name="a1" minOccurs="1" maxOccurs="1"/> <xsd:element name="a2" minOccurs="0"/> </xsd:all> with: <xsd:sequence> <xsd:element name="a1" minOccurs="0" maxOccurs="1"/> </xsd:sequence> So the restriction allows zero or one "a1" elements. Both cases are also valid in the base (the empty sequence because the all model group has minOccurs="0"). Best regards, Andreas Meissl