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Union types with restriction

File: Data.xml <?xml version="1.0"?> <Party xmlns="http://www.rntsoft.com"                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"                  xsi:schemaLocation="http://www.rntsoft.com Schema.xsd">         <Participants>             <Name>Item0</Name>             <Name>Item1</Name>         </Participants> </Party> File: Schema.xsd <?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"             targetNamespace="http://www.rntsoft.com"             xmlns="http://www.rntsoft.com"             elementFormDefault="qualified">     <xsd:simpleType name="Group0">         <xsd:restriction base="xsd:string">             <xsd:enumeration value="Item0"/>         </xsd:restriction>     </xsd:simpleType>     <xsd:simpleType name="Group1">         <xsd:restriction base="xsd:string">             <xsd:enumeration value="Item1"/>             <xsd:enumeration value="Item2"/>             <xsd:enumeration value="Item3"/>             <xsd:enumeration value="Item4"/>         </xsd:restriction>     </xsd:simpleType>     <xsd:simpleType name="Group2">         <xsd:restriction base="xsd:string">             <xsd:enumeration value="Item5"/>             <xsd:enumeration value="Item6"/>             <xsd:enumeration value="Item7"/>             <xsd:enumeration value="Item8"/>         </xsd:restriction>     </xsd:simpleType>     <xsd:simpleType name="Group3">         <xsd:restriction base="xsd:string">             <xsd:enumeration value="Item9"/>             <xsd:enumeration value="Item10"/>         </xsd:restriction>     </xsd:simpleType>     <xsd:simpleType name="Group4">         <xsd:restriction base="xsd:string">             <xsd:enumeration value="Item11"/>             <xsd:enumeration value="Item12"/>             <xsd:enumeration value="Item13"/>             <xsd:enumeration value="Item14"/>             <xsd:enumeration value="Item15"/>         </xsd:restriction>     </xsd:simpleType>     <xsd:simpleType name="Group5">         <xsd:restriction base="xsd:string">             <xsd:enumeration value="Item16"/>         </xsd:restriction>     </xsd:simpleType>     <xsd:simpleType name="Group6">         <xsd:restriction base="xsd:string">             <xsd:enumeration value="Item17"/>         </xsd:restriction>     </xsd:simpleType>     <xsd:simpleType name="CostelloFamily">         <xsd:union memberTypes="Group0 Group1 Group2 Group3                                  Group4 Group5 Group6"/>     </xsd:simpleType>     <xsd:element name="Party">         <xsd:complexType>              <xsd:sequence>                  <xsd:element name="Participants">                      <xsd:complexType>                          <xsd:sequence>                              <xsd:element name="Name" type="CostelloFamily" maxOccurs="unbounded"/>                          </xsd:sequence>                      </xsd:complexType>                  </xsd:element>             </xsd:sequence>         </xsd:complexType>     </xsd:element> </xsd:schema>