<xs:group name="particle">
<xs:choice>
<xs:element name="element" type="xs:localElement" />
<xs:element name="group" type="xs:groupRef" />
<xs:element ref="xs:all" />
<xs:element ref="xs:choice" />
<xs:element ref="xs:sequence" />
<xs:element ref="xs:any" />
</xs:choice>
</xs:group>
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