Implement ENUM

[mspaulik]

Test the following possible enum declarations will get translated to RDF.

enum Direction {
  North,
  East,
  South,
  West,
}

enum Direction {
  North: "north",
  East: "east",
  South: "south",
  West: "west",
}

enum Foo {
  One: 1,
  Ten: 10,
  Hundred: 100,
  Thousand: 1000,
}

enum Hour {
  Zero = 0,
  Quarter = 0.25,
  Half = 0.5,
  ThreeQuarter = 0.75,
}

Another possibility is composing enums:

enum DirectionExt {
  ...Direction,
  "North East",
  "North West",
  "South East",
  "South West",
}

[mspaulik]

fix range