Just to clarify, enum constants *can* contain cases, but they don't *have* to; other constant values are legitimate - including cases of other Enumerations.<?phpenum Suit{    case Hearts;    case Clubs;    case Spades;    case Diamonds;    public const Card = Size::Large; // A case from a different enum}enum Size{    case Small;    case Medium;    case Large;    public const Scale = 297/210; // A float}echo Suit::Diamonds::Card::Scale; // Getting the constant Scale from the constant Card in a Suit.?>