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>
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