code: public void setIf(XExpression newIf)
  	{
  		if (newIf != if_)
  		{
  			NotificationChain msgs = null;
  			if (if_ != null)
  				msgs = ((InternalEObject)if_).eInverseRemove(this, EOPPOSITE_FEATURE_BASE - XbasePackage.XIF_EXPRESSION__IF, null, msgs);
  			if (newIf != null)
  				msgs = ((InternalEObject)newIf).eInverseAdd(this, EOPPOSITE_FEATURE_BASE - XbasePackage.XIF_EXPRESSION__IF, null, msgs);
  			msgs = basicSetIf(newIf, msgs);
  			if (msgs != null) msgs.dispatch();
  		}
  		else if (eNotificationRequired())
  			eNotify(new ENotificationImpl(this, Notification.SET, XbasePackage.XIF_EXPRESSION__IF, newIf, newIf));
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated