Tree Structured Enumerations

namespace TreeStructuredEnumerations
{
    [Structured(100)]
    public enum AnimalKind
    {
        Unknown         = 00000,

        DomesticAnimals = 00001,
          Dog           = 00100,
            Dalmatin    = 10000,
            Greyhound   = 10001,
            Malamute    = 10002,
            Terrier     = 10003,
          Cat           = 00101,
        
        WildAnimals     = 00002,
          Ape           = 00200,
            Chimpanzee  = 20000,
            Gorrila     = 20001,
            Orangutan   = 20002,
          Deer          = 00201
    }
}