code: @Override
  	public void eUnset(int featureID) {
  		switch (featureID) {
  			case XtextPackage.GRAMMAR__NAME:
  				setName(NAME_EDEFAULT);
  				return;
  			case XtextPackage.GRAMMAR__USED_GRAMMARS:
  				getUsedGrammars().clear();
  				return;
  			case XtextPackage.GRAMMAR__DEFINES_HIDDEN_TOKENS:
  				setDefinesHiddenTokens(DEFINES_HIDDEN_TOKENS_EDEFAULT);
  				return;
  			case XtextPackage.GRAMMAR__HIDDEN_TOKENS:
  				getHiddenTokens().clear();
  				return;
  			case XtextPackage.GRAMMAR__METAMODEL_DECLARATIONS:
  				getMetamodelDeclarations().clear();
  				return;
  			case XtextPackage.GRAMMAR__RULES:
  				getRules().clear();
  				return;
  		}
  		super.eUnset(featureID);
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated