There are a variety of haskell libraries which are implementable through a common interface: self-describing parsers:

* a formlet is a self-describing parser.
* a regular old text parser can be self-describing.
* a command-line options parser is a self-describing parser.
* a mud command set is a self-describing parser.
* a json api can be a self-describing parser.
this package provides the documentation for a library for the haskell programming language. see http://www.haskell.org/ for more information on haskell.