code: @Override
  	public void eUnset(int featureID)
  	{
  		switch (featureID)
  		{
  			case XbasePackage.XIF_EXPRESSION__IF:
  				setIf((XExpression)null);
  				return;
  			case XbasePackage.XIF_EXPRESSION__THEN:
  				setThen((XExpression)null);
  				return;
  			case XbasePackage.XIF_EXPRESSION__ELSE:
  				setElse((XExpression)null);
  				return;
  			case XbasePackage.XIF_EXPRESSION__CONDITIONAL_EXPRESSION:
  				setConditionalExpression(CONDITIONAL_EXPRESSION_EDEFAULT);
  				return;
  		}
  		super.eUnset(featureID);
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated