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<xs:keyref name="e_refToeKey"
refer="eKey">
<xs:selector xpath="e_ref" />
<xs:field xpath="@e" />
</xs:keyref>
</xs:element>
<xs:element name="R">
<xs:complexType>
<xs:sequence>
<xs:element
maxOccurs="unbounded"
name="R1">
<xs:complexType>
<xs:sequence>
<xs:element ref="d_ref" />
<xs:element ref="e_ref" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
The XML document after normalization becomes
XML before normalization
XML document after normalization
<r1>
<d d="123">d1</d>
<e e="456">e1</e>
<e e="789">e2</e>
<r1>
<d>d1</d>
<e>e1</e>
</r1>
<r1>
<d_ref d="123"/>
<d>d1</d>
<e_ref e="456"/>
<e>e2></e>
</r1>
<r1>
</r1>
<r1>
<d>d2</d>
<e>e1</e>
</r1>
<d_ref d="123"/>
<e_ref e="789"/>
</r1>
<r1>
<d_ref d=”000”/>
<e_ref e=”456”/>
</r1>
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