The Grampa project consists of three related Haskell libraries:

• rank2classes is at the lowest level. It provides a set of type classes that mirror Functor and related type classes but for records.
• grammatical-parsers is a parser combinator and grammar combinator library that depends on rank2classes.
• deep-transformations depends on and extends rank2classes to operate on trees of mutually-recusive types. This library is independent of grammatical-parsers, but can be used to manipulate the parse trees produced by it.