libatd-ocaml-dev 2.12.0-3 (amd64 binary) in ubuntu mantic

 ATD stands for Adjustable Type Definitions. It is a type definition
 language designed to accommodate a variety of programming languages and
 data formats by the means of target-specific annotations. It supports
 sum types, parametrized types and inheritance. The library provides a
 parser and other tools useful for manipulating ATD type definitions.
 .
 This package contains the development files needed for programming
 with the library.