XML/XML Schema/union

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A union datatype by reference to existing types

   <source lang="xml">

<?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 

 targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
 elementFormDefault="qualified">
 <xs:simpleType name="integerOrData">
   <xs:union memberTypes="xs:integer xs:date" />
 </xs:simpleType>

</xs:schema> 

</source>


A union datatype can embed one or more <xs:simpleType> elements

   <source lang="xml">

<?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 

 targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
 elementFormDefault="qualified">
 <xs:simpleType name="myIntegerUnion">
   <xs:union>
     <xs:simpleType>
       <xs:restriction base="xs:integer" />
     </xs:simpleType>
     <xs:simpleType>
       <xs:restriction base="xs:NMTOKEN">
         <xs:enumeration value="undefined" />
       </xs:restriction>
     </xs:simpleType>
   </xs:union>
 </xs:simpleType>

</xs:schema> 

</source>


The order between derivation by list and derivation by union depends on the result to achieve

   <source lang="xml">

<?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" 

 targetNamespace="http://www.wbex.ru" xmlns="http://www.wbex.ru"
 elementFormDefault="qualified">
 <xs:simpleType name="listOfUnions">
   <xs:list>
     <xs:simpleType>
       <xs:union memberTypes="xs:date xs:integer" />
     </xs:simpleType>
   </xs:list>
 </xs:simpleType>
 <xs:simpleType name="UnionOfLists">
   <xs:union>
     <xs:simpleType>
       <xs:list itemType="xs:date" />
     </xs:simpleType>
     <xs:simpleType>
       <xs:list itemType="xs:integer" />
     </xs:simpleType>
   </xs:union>
 </xs:simpleType>

</xs:schema> 

</source>


Union anonymous simple types

   <source lang="xml">

File: Data.xml <?xml version="1.0"?> <Party xmlns="http://www.wbex.ru" 

                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xsi:schemaLocation=
                       "http://www.wbex.ru
                        Schema.xsd">
       <Participants>
           <Name>Item0</Name>
           <Name>Item1</Name>
           <Name>Item2</Name>
       </Participants>

</Party> File: Schema.xsd <?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" 

           targetNamespace="http://www.wbex.ru"
           xmlns="http://www.wbex.ru"
           elementFormDefault="qualified">
   <xsd:simpleType name="CostelloFamily">
       <xsd:union>
           <xsd:simpleType>
               <xsd:restriction base="xsd:string">
                   <xsd:enumeration value="Item0"/>
               </xsd:restriction>
           </xsd:simpleType>
           <xsd:simpleType>
               <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>
               <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>
               <xsd:restriction base="xsd:string">
                   <xsd:enumeration value="Item9"/>
                   <xsd:enumeration value="Item10"/>
               </xsd:restriction>
           </xsd:simpleType>
           <xsd:simpleType>
               <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>
               <xsd:restriction base="xsd:string">
                   <xsd:enumeration value="Item16"/>
               </xsd:restriction>
           </xsd:simpleType>
           <xsd:simpleType>
               <xsd:restriction base="xsd:string">
                   <xsd:enumeration value="Item17"/>
               </xsd:restriction>
           </xsd:simpleType>
       </xsd:union>
   </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> 

</source>


union types with restriction

   <source lang="xml">

File: Data.xml <?xml version="1.0"?> <Party xmlns="http://www.wbex.ru" 

                xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                xsi:schemaLocation="http://www.wbex.ru 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.wbex.ru"
           xmlns="http://www.wbex.ru"
           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> 

</source>


union with memberTypes

   <source lang="xml">

File: Data.xml <?xml version="1.0"?> <schema xmlns="http://www.wbex.ru" 

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation=
                   "http://www.wbex.ru
                    maxOccurs.xsd">
       <element maxOccurs="unbounded"/>

</schema>

File: maxOccurs.xsd <?xml version="1.0"?> <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" 

       targetNamespace="http://www.wbex.ru"
       xmlns="http://www.wbex.ru"
       elementFormDefault="qualified">
   <xsd:simpleType name="unbounded_type">
       <xsd:restriction base="xsd:string">
           <xsd:enumeration value="unbounded"/>
       </xsd:restriction>
   </xsd:simpleType>
   <xsd:simpleType name="maxOccurs_type">
       <xsd:union memberTypes="unbounded_type xsd:nonNegativeInteger"/>
   </xsd:simpleType>
   <xsd:element name="schema">
       <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="element">
                    <xsd:complexType>
                        <xsd:attribute name="maxOccurs" type="maxOccurs_type" default="1"/>
                    </xsd:complexType>
                </xsd:element>
           </xsd:sequence>
       </xsd:complexType>
   </xsd:element>

</xsd:schema> 

</source>
Источник — «http://wbex.ru/index.php?title=XML/XML_Schema/union&oldid=10049»