code: @Override
  	public void eUnset(int featureID)
  	{
  		switch (featureID)
  		{
  			case XtypePackage.XFUNCTION_TYPE_REF__PARAM_TYPES:
  				getParamTypes().clear();
  				return;
  			case XtypePackage.XFUNCTION_TYPE_REF__RETURN_TYPE:
  				setReturnType((JvmTypeReference)null);
  				return;
  			case XtypePackage.XFUNCTION_TYPE_REF__TYPE:
  				setType((JvmType)null);
  				return;
  			case XtypePackage.XFUNCTION_TYPE_REF__INSTANCE_CONTEXT:
  				setInstanceContext(INSTANCE_CONTEXT_EDEFAULT);
  				return;
  		}
  		super.eUnset(featureID);
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated