docs: @Override
  	public void setDefaultValue(XExpression newDefaultValue)
  	{
  		if (newDefaultValue != defaultValue)
  		{
  			NotificationChain msgs = null;
  			if (defaultValue != null)
  				msgs = ((InternalEObject)defaultValue).eInverseRemove(this, EOPPOSITE_FEATURE_BASE - SarlPackage.SARL_FORMAL_PARAMETER__DEFAULT_VALUE, null, msgs);
  			if (newDefaultValue != null)
  				msgs = ((InternalEObject)newDefaultValue).eInverseAdd(this, EOPPOSITE_FEATURE_BASE - SarlPackage.SARL_FORMAL_PARAMETER__DEFAULT_VALUE, null, msgs);
  			msgs = basicSetDefaultValue(newDefaultValue, msgs);
  			if (msgs != null) msgs.dispatch();
  		}
  		else if (eNotificationRequired())
  			eNotify(new ENotificationImpl(this, Notification.SET, SarlPackage.SARL_FORMAL_PARAMETER__DEFAULT_VALUE, newDefaultValue, newDefaultValue));
  	}