code: public void setGuardCondition(Condition newGuardCondition) {
  		if (newGuardCondition != guardCondition) {
  			NotificationChain msgs = null;
  			if (guardCondition != null)
  				msgs = ((InternalEObject)guardCondition).eInverseRemove(this, EOPPOSITE_FEATURE_BASE - XtextPackage.GROUP__GUARD_CONDITION, null, msgs);
  			if (newGuardCondition != null)
  				msgs = ((InternalEObject)newGuardCondition).eInverseAdd(this, EOPPOSITE_FEATURE_BASE - XtextPackage.GROUP__GUARD_CONDITION, null, msgs);
  			msgs = basicSetGuardCondition(newGuardCondition, msgs);
  			if (msgs != null) msgs.dispatch();
  		}
  		else if (eNotificationRequired())
  			eNotify(new ENotificationImpl(this, Notification.SET, XtextPackage.GROUP__GUARD_CONDITION, newGuardCondition, newGuardCondition));
  	}
docs: <!-- begin-user-doc -->
  <!-- end-user-doc -->
  @generated