public class MyHandler extends AbstractHandler {

	@SuppressWarnings("unchecked")
	@Override
	public Object execute(ExecutionEvent event) throws ExecutionException {
		ISelection selection = HandlerUtil.getActiveWorkbenchWindow(event)
				.getActivePage().getSelection();
		if (selection != null & selection instanceof IStructuredSelection) {
			IStructuredSelection strucSelection = (IStructuredSelection) selection;
			Object o = strucSelection.getFirstElement();
			if (o instanceof IFile) {
				IFile f = (IFile)o;
				ResourceSet rs = new ResourceSetImpl();
				Resource r = rs.getResource(URI.createURI(f.getLocationURI().toString()), true);
				try {
					r.load(null);
					Model m = (Model) r.getContents().get(0);
					for (Greeting g : m.getGreetings()) {
						System.out.println(g.getName());
					}
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		return null;
	}

}