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In my opinion schemaTest 'particlesZ033_g' of group 'particlesZ033_g' should be valid in XSD 1.1. In XSD 1.0 the content model contains an ambiguity between an element declaration particle and a wildcard particle. In XSD 1.1 the element declaration particle has precedence over the wildcard particle, thus the constraints of unique particle attribution are not violated in XSD 1.1.