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The .NET schema compiler complains about the use of xs:sequence here. It's expecting a complexType or simpleType. <xs:element name="elementContainingApproximateDate"> <xs:sequence> <xs:element name="e" type="s:approximateDate"/> </xs:sequence> </xs:element> <xs:element name="elementContainingDateTime" substitutionGroup="s:elementContainingApproximateDate"> <xs:sequence> <xs:element name="e" type="xs:dateTime"/> </xs:sequence> </xs:element>
Fixed, the schema is now valid.
Thanks.