Maybe = Nullable

Algebraischer Datentyp (Haskell):

data Maybe a = Nothing | Just a

http://hackage.haskell.org/packages/archive/base/latest/doc/html/Prelude.html#t:Maybe

Realisierung in C#: Nullable<T>

http://msdn.microsoft.com/en-us/library/2cf62fcy.aspx