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date	2007.03.06.17.30.00;	author TWikiGuest;	state Exp;
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date	2006.10.05.19.41.39;	author JacobAsiedu;	state Exp;
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%META:TOPICINFO{author="JacobAsiedu" date="1160077299" format="1.1" version="1.1"}%
%META:TOPICPARENT{name="DiscussionFor1dot1RC2"}%
The uniqueness constraint(<nop>CharacterStateKey) on <nop>StateDefinition's ensure's that global states cannot be referenced more than once within Characters in a Terminology. This is because of  <verbatim><xs:field xpath="@@id|@@ref"/></verbatim> in the identity constraint declaration.

This issue is illustrated with the example below. Attempting to reference 'efg301' more than once results in a validation error.

<verbatim>
...
        <ConceptStates>
          <StateDefinition id="efg301">
            <Representation>
              <Label xml:lang="en" audience="efg2">brown</Label>
            </Representation>
          </StateDefinition>
....
  <CategoricalCharacter id="efg458">
        <Representation>
          <Label xml:lang="en" audience="efg2">Flower Color</Label>
        </Representation>
        <States>
          <StateReference ref="efg301"/>
        </States>
      </CategoricalCharacter>
  <CategoricalCharacter id="efg459">
        <Representation>
          <Label xml:lang="en" audience="efg2">Leaf Color</Label>
        </Representation>
        <States>
          <StateReference ref="efg301"/>
        </States>
      </CategoricalCharacter>
</verbatim>

A solution will be to declare both <nop>ConceptStateKey and <nop>CharacterStateKey  as follows

<verbatim>
	<xs:unique name="SomeUniqueName">
			
			<xs:selector xpath=".//u:StateDefinition"/>
			<xs:field xpath="@@id"/>
		</xs:unique>
</verbatim>

This ensures that id's on   <nop>StateDefinition's are unique throughout a document.

-- Main.JacobAsiedu - 05 Oct 2006
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