[Newbies] Enumeration type implementation

[Göran Krampe]

I would in this case use a so called SharedPool. If you are using Squeak 
then take for example a look at GZipConstants (inherits from SharedPool, 
has classVariablesNames for each key, initialize them in class side 
initialize method) and a use of it in GZipReadStream (it just lists it 
in the class definition under poolDictionaries: and then just use those 
keys directly as if they were globals.

regards, Göran