class KC_Widget
{
    [Key] String Id;
    string Color;
    uint32 Size;

    [Static]
    uint32 Add([In] uint32 X, [In] uint32 Y);
};

[Association]
class KC_Gadget
{
    [Key] KC_Widget REF Left;
    [Key] KC_Widget REF Right;
};

[Indication]
class KC_Alert
{
    string Message;
};