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Union Based on xs

File: Data.xml <?xml version="1.0"?> <data xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"               xsi:schemaLocation="http://www.rntsoft.com Schema.xsd"               xmlns="http://www.rntsoft.com"               >  1234567890 </data> File: Schema.xsd <?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"   targetNamespace="http://www.rntsoft.com" xmlns="http://www.rntsoft.com"   elementFormDefault="qualified">     <xs:element name="data" type="myIntegerUnion"/>   <xs:simpleType name="myIntegerUnion">     <xs:union memberTypes="xs:integer">       <xs:simpleType>         <xs:restriction base="xs:NMTOKEN">           <xs:enumeration value="undefined" />         </xs:restriction>       </xs:simpleType>     </xs:union>   </xs:simpleType> </xs:schema>