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XML Schema for XML Schema
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http://www.w3.org/2001/XMLSchema
group identityConstraint

Documentation
The three kinds of identity constraints, all with
                     type of or derived from 'keybase'.
Model

(unique | key | keyref)

Local Usage
allModel, element, localElement, topLevelElement
Source
<xs:group name="identityConstraint">
  <xs:choice>
    <xs:element ref="xs:unique"/>
    <xs:element ref="xs:key"/>
    <xs:element ref="xs:keyref"/>
  </xs:choice>
</xs:group>
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XML Schema for XML Schema
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