wiki-archive/twiki/data/SDD/IssuesWithCharacterStateIdentityConstraint.txt,v

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date	2009.11.25.03.14.34;	author GarryJolleyRogers;	state Exp;
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date	2006.10.05.19.58.00;	author JacobAsiedu;	state Exp;
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@%META:TOPICINFO{author="GarryJolleyRogers" date="1259118874" format="1.1" version="1.7"}%
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In SDD1.1RC2 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 !ConceptStateKey and !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. 

I have implemented this in SDD.xsd at rev 39 of the Subversion trunk

-- Main.JacobAsiedu - 05 Oct 2006

The issue seems indeed to be a bug. I believe that the result should make sure that:
   * concept state id-values are unique within the entire document (not only within a single concept).
   * concept state references are unique within the scope of a single character. If the latter is truly difficult, we could drop the constraint.

Did we have any other intentions? I cannot remember.

At the moment I cannot follow your proposed solution - please check for me whether the constraint above are stated correctly, and whether your solution fullfills them.

Thanks!

-- Main.GregorHagedorn - 20 Oct 2006@


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I have implemented this in BDI.SDD.xsd at rev 39 of the Subversion trunk
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-- Main.GregorHagedorn - 20 Oct 2006
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I have implemented this in SDD.xsd at rev 39 of the Subversion trunk
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I have implemented this in SDD.xsd at rev 39 of the Subversion trunk
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-- Main.JacobAsiedu - 05 Oct 2006
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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
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A solution will be to declare both ConceptStateKey and CharacterStateKey as follows
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