| diagram | ![]()  | 
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| namespace | http://www.w3.org/2001/XMLSchema | ||
| children | xs:unique xs:key xs:keyref | ||
| used by | 
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| annotation | 
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| source | <xs:group name="identityConstraint"> <xs:annotation> <xs:documentation>The three kinds of identity constraints, all with type of or derived from 'keybase'. </xs:documentation> </xs:annotation> <xs:choice> <xs:element ref="xs:unique"/> <xs:element ref="xs:key"/> <xs:element ref="xs:keyref"/> </xs:choice> </xs:group>  |