Parametric Compositional Data Types.
Based on Wouter Swierstra's Functional Pearl Data types a la carte (Journal of Functional Programming, 18(4):423-436, 2008, http://dx.doi.org/10.1017/S0956796808006758), this package provides a framework for defining recursive data types in a compositional manner with support for binders.
This package implemements parametric compositional data types (Workshop on Mathematically Structured Functional Programming, 3-24, 2012, http://dx.doi.org/10.4204/EPTCS.76.3), generalising compositional data types (as implemented in the compdata package) with support for parametric higher-order abstract syntax (PHOAS).
Examples of using parametric compositional data types are bundled with the package in the folder examples.