docs: @Override
  	public boolean eIsSet(int featureID) {
  		switch (featureID) {
  			case XtextPackage.TYPE_REF__METAMODEL:
  				return metamodel != null;
  			case XtextPackage.TYPE_REF__CLASSIFIER:
  				return classifier != null;
  		}
  		return super.eIsSet(featureID);
  	}