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