1 <?xml version="1.0" encoding="UTF-8"?> 2 <xsd:schema 3 xmlns="IdConstrDefs/targetNS" 4 xmlns:xsd="http://www.w3.org/2001/XMLSchema" 5 targetNamespace="IdConstrDefs/targetNS"> 6 7 <xsd:element name="roota"> 8 <xsd:complexType> 9 <xsd:sequence maxOccurs="unbounded"> 10 <xsd:element name="person"/> 11 </xsd:sequence> 12 </xsd:complexType> 13 <xsd:key name="KEY"> 14 <xsd:selector xpath="./person"/> 15 <xsd:field xpath="."/> 16 </xsd:key> 17 <xsd:keyref name="KEYREF" refer="KEY"> 18 <xsd:selector xpath="./person"/> 19 <xsd:field xpath="@parent"/> 20 </xsd:keyref> 21 </xsd:element> 22 23 </xsd:schema>