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<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:constraints="http://www.w3.org/constraints"
targetNamespace="http://www.w3.org/constraints">
<xsd:element name="a" type="constraints:myList">
<xsd:unique name="myId">
<xsd:selector xpath="./b"/>
<xsd:field xpath="@id"/>
</xsd:unique>
</xsd:element>
<xsd:complexType name="myList">
<xsd:sequence minOccurs="1">
<xsd:element name="b" minOccurs="1" maxOccurs="unbounded">
<xsd:complexType>
<xsd:attribute name="id" type="xsd:NCName"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
<xsd:element name="a2" type="constraints:myList2">
<xsd:key name="myId2">
<xsd:selector xpath="./b2"/>
<xsd:field xpath="@id"/>
</xsd:key>
<xsd:keyref name="myIdref" refer="constraints:myId2">
<xsd:selector xpath="./b2ref/c"/>
<xsd:field xpath="@idref"/>
</xsd:keyref>
</xsd:element>
<xsd:complexType name="myList2">
<xsd:sequence minOccurs="1">
<xsd:element name="b2" minOccurs="1" maxOccurs="unbounded">
<xsd:complexType>
<xsd:attribute name="id" type="xsd:NCName"/>
</xsd:complexType>
</xsd:element>
<xsd:element name="b2ref" minOccurs="0" maxOccurs="unbounded">
<xsd:complexType>
<xsd:sequence minOccurs="1">
<xsd:element name="c" minOccurs="1" maxOccurs="unbounded">
<xsd:complexType>
<xsd:attribute name="idref" type="xsd:NCName" use="required"/>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:sequence>
</xsd:complexType>
</xsd:schema>
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