Comment 1 Yann Tanguy 2011-02-02 12:49:13 EST

It is currently possible to verify some graphical info by using the cross referencer (example below). 

public class PortShownInNoDiagram extends AbstractModelConstraint {

	@Override
	public IStatus validate(IValidationContext ctx)
	{
		Port elt = (Port) ctx.getTarget ();
		EReference[] ref = { NotationPackage.eINSTANCE.getView_Element() };
		Collection<?> refs = EMFCoreUtil.getReferencers(elt, ref);
		
		if (refs.isEmpty()) {	
			return ctx.createFailureStatus ("Port should be shown at least in one diagram ("+elt.getQualifiedName()+")");
		}

		return ctx.createSuccessStatus();
	}
}

Comment 2 Camille Letavernier 2013-10-16 07:03:01 EDT

Cross referencers are dangerous for performances, but I guess they may be required in this case.

The validation should run on Notation elements (This would not cover this specific example however).

I think that currently, the validation only runs for semantic (UML) elements and stereotype applications.