          one back-end. On the front-end side, you will find three of them which are as
                    many state machine description languages, with many more possible. For potential
                    language writers, this document contains a <a class="link" href="ch06s02.html#internals-front-back-interface">description of the interface
                        between front-end and back-end</a>.</p><p>The first front-end is an adaptation of the example provided in the <a class="link" href="http://b