docs: @Override
  	protected void clearReference(EObject obj, EReference ref) {
  		super.clearReference(obj, ref);
  		if (obj.eIsSet(ref) && ref.getEType().equals(XtextPackage.Literals.TYPE_REF)) {
  			INode node = NodeModelUtils.getNode((EObject) obj.eGet(ref));
  			if (node == null)
  				obj.eUnset(ref);
  		}
  		if (obj.eIsSet(ref) && ref == XtextPackage.Literals.CROSS_REFERENCE__TERMINAL) {
  			INode node = NodeModelUtils.getNode((EObject) obj.eGet(ref));
  			if (node == null)
  				obj.eUnset(ref);
  		}
  		if (ref == XtextPackage.Literals.RULE_CALL__RULE) {
  			obj.eUnset(XtextPackage.Literals.RULE_CALL__EXPLICITLY_CALLED);
  		}
  	}