Bug 303831 Warnings logged when trying to merge changes to an MPart's 'closeable' attribute
Warnings are printed out to syserr. --- WARNING: Unknown feature found, reconciliation may fail: Part#closeable
bundles/org.eclipse.e4.ui.workbench/src/org/eclipse/e4/workbench/ui/internal/XMLModelReconciler.java
* @param container
	 *            the parent container of the object
	 * @return the object's id as recorded by the containing resource
	 */
	private static String getResourceId(EObject object, EObject container) {
		Resource resource = object.eResource();
		if (resource instanceof XMLResource) {
			return ((XMLResource) resource).getID(object);
		}
		resource = container.eResource();
		if (resource instanceof XMLResource) {
			return ((XMLResource) resource).getID(object);
		}
		throw new IllegalStateException(object + " could not be identified"); 
	}
	private static String getLocalId(Object object) {
		EObject reference = (EObject) object;
		return getResourceId(reference, reference.eContainer());
	}
	/**
	 * Retrieves the original containing parent object of the specified reference. If
	 * <code>null</code> is returned, the object was not initially known by the change recorder.
	 * 
	 * @param reference
	 *            the object to find its original container for
	 * @return the original parent container of the object, or <code>null</code> if it did not
	 *         initially exist
	 */
	private EObject getOriginalContainer(EObject reference) {
		if (changeDescription == null) {