[news.eclipse.modeling.gmf] Link between GMF Figure and EMF Node, Proper

[Rodolphe Beck <rodolphe.beck@xxxxxxxxx>]

Hi,

I have two problems with my modeler :

First, I need to export my diagram into a custom xml file format. I 
found how to do it by recovering the list of items composing my diagram 
and serializing them using XStream.

My diagram is like the following :
http://img132.imageshack.us/my.php?image=conceptsdp4.png

A concept can be linked to one or more concepts, or to one of more items

When I generate my xml export though, it generates that :
<?xml version="1.0" encoding="UTF-8"?>
<pivot>
  <concept nom="Concept">
    <item nom="Test">
      <item nom="Test 2"/>
    </item>
  </concept>
  <concept nom="Concept 0">
    <concept nom="Concept">
      <item nom="Test">
        <item nom="Test 2"/>
      </item>
    </concept>
  </concept>
</pivot>

What I want to do is to generate the part that corresponds to the 
selected concept only. How can y translate my ConceptEditPart object 
(the one I get in my selectionChanged method) into the corresponding 
EObject ?

Second question :
My 'items' have a 'name' property, what I want to do is to allow the 
user to create one the regular way ie with the tool palette and by 
providing a name, but I want him to be able to pick an existing name 
from a database.

Here again, I know how to retrieve the data from a datasource (excel 
file, db2 database...) I imagine I will have to modify the ItemEditPart 
class to include a dropdown... But I don't know what to use : the name 
label is currently a WrappingLabel, is there a class that acts like a 
dropdown ? Or maybe in the properties view of the figure ? Or do it myself ?

Thanks for your answers.