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<complexType name='Form' description='A list of uniquely keyed items and a list of references to the keys - the [refer] attribute is used to specify the [key] constraint to which refers the [keyref] - [keyref] Instance constraint example from Eleusoft Application Documentation'>
    <field name='Item' minOccurs='2' maxOccurs='5' extra:lc.simple='true' extra:lc.buttonsright='true' type='Item'/>
    <field name='Reference' minOccurs='1' maxOccurs='10' type='xs:string' extra:lc.simple='true' extra:lc.buttonsright='true' />
    <constraint name='EachItemMustHaveUniqueKey' 
      category='key' selector='./Item'>
        <expression path='Key'/>
    </constraint>
    <constraint name='EachReferenceMustReferenceOneKey' 
      category='keyref' selector='./Reference' refer='EachItemMustHaveUniqueKey' >
        <expression path='.'/>
    </constraint>
</complexType>
<complexType name='Item' >
    <field name='Key' type='xs:string' extra:ctrl.emptyisnull='true' minOccurs='0' extra:form.maybenull='true'/>
</complexType>