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[news.eclipse.modeling.gmf] Problems with label referencing a derived attribute 
Hi,
  I'm trying to do this:

I have three classes: RootClass, Action and Element. Action and Element are children of RootClass. What I want to do is that the value of the attribute actionName of the class Element is equal to the value of the attribute name of the class Action.

  Below, it shows the ecore metamodel:

<?xml version="1.0" encoding="UTF-8"?>
<ecore:EPackage xmi:version="2.0"
xmlns:xmi="http://www.omg.org/XMI"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:ecore="http://www.eclipse.org/emf/2002/Ecore"; name="my"
nsURI="my" nsPrefix="my">
<eClassifiers xsi:type="ecore:EClass" name="RootClass">
<eStructuralFeatures xsi:type="ecore:EReference" name="actions" upperBound="-1"
eType="#//Action" containment="true"/>
<eStructuralFeatures xsi:type="ecore:EReference" name="elements" upperBound="-1"
eType="#//Element" containment="true"/>
</eClassifiers>
<eClassifiers xsi:type="ecore:EClass" name="Action">
<eStructuralFeatures xsi:type="ecore:EAttribute" name="name" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
</eClassifiers>
<eClassifiers xsi:type="ecore:EClass" name="Element">
<eStructuralFeatures xsi:type="ecore:EAttribute" name="name" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString"/>
<eStructuralFeatures xsi:type="ecore:EAttribute" name="actionName" eType="ecore:EDataType http://www.eclipse.org/emf/2002/Ecore#//EString";
derived="true"/>
<eStructuralFeatures xsi:type="ecore:EReference" name="action" eType="#//Action"/>
</eClassifiers>
</ecore:EPackage>


I did the following: I generated the genmodel, model code and edit code.
I modified the file ElementImpl.java of the package my.impl, I replaced ?return actionName;? for ?return this.getAction().getName();? in the getActionName() method.
I did the gmfgraph, gmftool and gmfmap models.
I generated gmfgen model, and .diagram code.

The problem is that in gmfmap model, if I put the feature label mapping of actionName, when I run the .diagram and I create an Element node the node is created in the top-left corner (this is the way to GMF for indicating an error).

How can I do the label of actionName?

Below, it shows the models, the last two models are gmfmap without actionName FLM(Feature Label Mapping) and gmfmap with actionName FLM:

gmfgraph model:

<?xml version="1.0" encoding="UTF-8"?>
<gmfgraph:Canvas xmi:version="2.0"
xmlns:xmi="http://www.omg.org/XMI";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xmlns:gmfgraph="http://www.eclipse.org/gmf/2006/GraphicalDefinition"; name="my">
<figures
name="Default">
<descriptors
name="ActionFigure">
<actualFigure
xsi:type="gmfgraph:Rectangle"
name="ActionFigure">
<children
xsi:type="gmfgraph:Label"
name="ActionNameFigure"
text="ActionName"/>
</actualFigure>
<accessors
figure="//@figures.0/@descriptors.0/@actualFigure/@children.0"/>
</descriptors>
<descriptors
name="ElementFigure">
<actualFigure
xsi:type="gmfgraph:Rectangle"
name="ElementFigure">
<children
xsi:type="gmfgraph:Label"
name="ElementNameFigure"
text="ElementName"/>
<children
xsi:type="gmfgraph:Label"
name="ElementActionNameFigure"
text=""/>
</actualFigure>
<accessors
figure="//@figures.0/@descriptors.1/@actualFigure/@children.0"/>
<accessors
figure="//@figures.0/@descriptors.1/@actualFigure/@children.1"/>
</descriptors>
</figures>
<nodes
name="Action"
figure="ActionFigure"/>
<nodes
name="Element"
figure="ElementFigure"/>
<labels
name="ActionName"
figure="ActionFigure"
accessor="//@figures.0/@descriptors.0/@accessors.0"/>
<labels
name="ElementName"
figure="ElementFigure"
accessor="//@figures.0/@descriptors.1/@accessors.0"/>
<labels
name="ElementActionName"
figure="ElementFigure"
accessor="//@figures.0/@descriptors.1/@accessors.1"/>
</gmfgraph:Canvas>


gmftool model:

<?xml version="1.0" encoding="UTF-8"?>
<gmftool:ToolRegistry xmi:version="2.0"
   xmlns:xmi="http://www.omg.org/XMI";
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
   xmlns:gmftool="http://www.eclipse.org/gmf/2005/ToolDefinition";>
 <palette
     title="myPalette">
   <tools
       xsi:type="gmftool:ToolGroup"
       title="my">
     <tools
         xsi:type="gmftool:CreationTool"
         title="Action"
         description="Create new Action"/>
     <tools
         xsi:type="gmftool:CreationTool"
         title="Element"
         description="Create new Element"/>
   </tools>
 </palette>
</gmftool:ToolRegistry>


gmfmap model without actionName FLM:

<?xml version="1.0" encoding="UTF-8"?>
<gmfmap:Mapping xmi:version="2.0"
   xmlns:xmi="http://www.omg.org/XMI";
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
   xmlns:gmfmap="http://www.eclipse.org/gmf/2008/mappings";
   xmlns:gmftool="http://www.eclipse.org/gmf/2005/ToolDefinition";>
 <nodes>
   <containmentFeature
       href="My.ecore#//RootClass/elements"/>
   <ownedChild>
     <domainMetaElement
         href="My.ecore#//Element"/>
     <labelMappings
         xsi:type="gmfmap:FeatureLabelMapping">
       <diagramLabel
           href="My.gmfgraph#ElementName"/>
       <features
           href="My.ecore#//Element/name"/>
     </labelMappings>
     <tool
         xsi:type="gmftool:CreationTool"
         href="My.gmftool#//@palette/@tools.0/@tools.1"/>
     <diagramNode
         href="My.gmfgraph#Element"/>
   </ownedChild>
 </nodes>
 <nodes>
   <containmentFeature
       href="My.ecore#//RootClass/actions"/>
   <ownedChild>
     <domainMetaElement
         href="My.ecore#//Action"/>
     <labelMappings
         xsi:type="gmfmap:FeatureLabelMapping">
       <diagramLabel
           href="My.gmfgraph#ActionName"/>
       <features
           href="My.ecore#//Action/name"/>
     </labelMappings>
     <tool
         xsi:type="gmftool:CreationTool"
         href="My.gmftool#//@palette/@tools.0/@tools.0"/>
     <diagramNode
         href="My.gmfgraph#Action"/>
   </ownedChild>
 </nodes>
 <diagram>
   <diagramCanvas
       href="My.gmfgraph#my"/>
   <domainModel
       href="My.ecore#/"/>
   <domainMetaElement
       href="My.ecore#//RootClass"/>
   <palette
       href="My.gmftool#//@palette"/>
 </diagram>
</gmfmap:Mapping>


gmfmap model with actionName FLM:

<?xml version="1.0" encoding="UTF-8"?>
<gmfmap:Mapping xmi:version="2.0"
   xmlns:xmi="http://www.omg.org/XMI";
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
   xmlns:gmfmap="http://www.eclipse.org/gmf/2008/mappings";
   xmlns:gmftool="http://www.eclipse.org/gmf/2005/ToolDefinition";>
 <nodes>
   <containmentFeature
       href="My.ecore#//RootClass/elements"/>
   <ownedChild>
     <domainMetaElement
         href="My.ecore#//Element"/>
     <labelMappings
         xsi:type="gmfmap:FeatureLabelMapping">
       <diagramLabel
           href="My.gmfgraph#ElementName"/>
       <features
           href="My.ecore#//Element/name"/>
     </labelMappings>
     <labelMappings
         xsi:type="gmfmap:FeatureLabelMapping">
       <diagramLabel
           href="My.gmfgraph#ElementActionName"/>
       <features
           href="My.ecore#//Element/actionName"/>
     </labelMappings>
     <tool
         xsi:type="gmftool:CreationTool"
         href="My.gmftool#//@palette/@tools.0/@tools.1"/>
     <diagramNode
         href="My.gmfgraph#Element"/>
   </ownedChild>
 </nodes>
 <nodes>
   <containmentFeature
       href="My.ecore#//RootClass/actions"/>
   <ownedChild>
     <domainMetaElement
         href="My.ecore#//Action"/>
     <labelMappings
         xsi:type="gmfmap:FeatureLabelMapping">
       <diagramLabel
           href="My.gmfgraph#ActionName"/>
       <features
           href="My.ecore#//Action/name"/>
     </labelMappings>
     <tool
         xsi:type="gmftool:CreationTool"
         href="My.gmftool#//@palette/@tools.0/@tools.0"/>
     <diagramNode
         href="My.gmfgraph#Action"/>
   </ownedChild>
 </nodes>
 <diagram>
   <diagramCanvas
       href="My.gmfgraph#my"/>
   <domainModel
       href="My.ecore#/"/>
   <domainMetaElement
       href="My.ecore#//RootClass"/>
   <palette
       href="My.gmftool#//@palette"/>
 </diagram>
</gmfmap:Mapping>


				Thanks for your time.