Graphical Description Creation Wizard
To create a new graphical description resource, you need to use the creation wizard :
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Right click on your project, select New > Other...
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Select EMF Tools > Graphical Description Model, click Next

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Select the filename (sample.graphdesc)

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Select the model(s) you want to represent as a diagram ; we select the school model for the example

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In the EClass selection page, select the EClass list you want to represent ; we select all the classes for the example

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In the EReference selection page, select the EReferences list you want to represent. A special button allows to select the containment features ; we select all the EReferences for the example

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Click Finish (there is no selection page for the EAttributes, all the EAttributes are selected by default)

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Once the graphical desription has been initialized, it is possible to start editing it with the Graphical Description Editor.