Author: Christian.Queinnec@lip6.fr

## Introduction

Independently of the development of Objective CAML, several extensions of the language appeared. One of these, named O'Labl, was integrated with Objective CAML, starting with version 3.00.
This appendix describes briefly the new features offered in the current version of Objective CAML at the time of this writing, that is. Objective CAML 3.04. This version can be found on the CD-ROM accompanying this book. The new features include:

- labels;
- optional arguments;
- polymorphic constructors;
- the `ocamlbrowser` IDE;
- the `LablTk` library.

The reader is referred to the Objective CAML reference manual for a more detailed description of these features.