MAPINFO is a definition language originally introduced by Hexen.
Note: This language is entirely separate to and should not be confused with, the DED Map Info definition type.
Since it's introduction in Hexen, the MAPINFO definition language has seen many extensions and expanded syntaxes in other Doom source ports. These extensions have resulted in a set of somewhat conflicting "dialects".
All features in this dialect are available in all supported games, with the exception of hubs; which are currently limited to Hexen.