docs: public void setLeft(Keyword newLeft) {
  		if (newLeft != left) {
  			NotificationChain msgs = null;
  			if (left != null)
  				msgs = ((InternalEObject)left).eInverseRemove(this, EOPPOSITE_FEATURE_BASE - XtextPackage.CHARACTER_RANGE__LEFT, null, msgs);
  			if (newLeft != null)
  				msgs = ((InternalEObject)newLeft).eInverseAdd(this, EOPPOSITE_FEATURE_BASE - XtextPackage.CHARACTER_RANGE__LEFT, null, msgs);
  			msgs = basicSetLeft(newLeft, msgs);
  			if (msgs != null) msgs.dispatch();
  		}
  		else if (eNotificationRequired())
  			eNotify(new ENotificationImpl(this, Notification.SET, XtextPackage.CHARACTER_RANGE__LEFT, newLeft, newLeft));
  	}