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<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="A" type="xs:string"/>
<xs:element name="B" type="xs:string"/>
<!-- Circularity between two groups -->
<xs:group name="group1">
<xs:sequence>
<xs:element ref="A"/>
<xs:group ref="group2"/>
</xs:sequence>
</xs:group>
<xs:group name="group2">
<xs:sequence>
<xs:element ref="B"/>
<xs:group ref="group1"/>
</xs:sequence>
</xs:group>
<!-- Self circularity case-->
<xs:group name="groupC">
<xs:sequence>
<xs:element ref="A"/>
<xs:group ref="groupC"/>
</xs:sequence>
</xs:group>
</xs:schema>
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