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The IDREFS data type is derived from the IDREF type

The value space is the set of finite-, nonzero-length sequences of IDREF values.  The lexical space is the white-space-separated list of IDREF values. <!-- schema --> <xsd:complexType name="bankref">   <xsd:sequence>    <xsd:element name="bank" minOccurs="0"     maxOccurs="unbounded">     <xsd:complexType>      <xsd:complexContent>       <xsd:extension base="xsd:anyType">        <xsd:attribute name="branch" type="xsd:ID"/>       </xsd:extension>      </xsd:complexContent>     </xsd:complexType>    </xsd:element>   </xsd:sequence> </xsd:complexType> <xsd:element name="city">   <xsd:complexType>    <xsd:complexContent>     <xsd:extension base="xsd:anyType">      <xsd:attribute name="branch_division"       type="xsd:IDREFS"/>     </xsd:extension>    </xsd:complexContent>   </xsd:complexType> </xsd:element> <!-- instance document --> <bank branch="412x">Northern</bank> <bank branch="513a">Central</bank> <bank branch="793c">Southern</bank> <city branch_division="412x 513a 793c">Chicago</city>