Tool for converting a finite state machine in XML (more specifically, a modified
form of SCXML) into both a java abstract base class, and a dot graph description
file suitable for generating an image of the state machine.

  Below is an example of an state machine used to enter a PIN code:

<?xml version="1.0" encoding="UTF-8"?>
<scxml xmlns="http://www.w3.org/2005/07/scxml"
        name="com.google.common.labs.fsm.CodeEntry" initial="Ready"
        base="BaseState">
    <state id="BaseState">
      <transition event="ResetPressed" action="ClearCodeEntryBuffer"
          target="Ready" />
      </state>
    <state id="Ready">
      <transition event="DigitPressed" action="Beep" target="Ready" />
      <transition event="EnterPressed" target="ValidatingEntry" >
        <action id="DoubleBeep" />
        <action id="PerformValidation" />
      </transition>
    </state>
    <state id="ValidatingEntry">
      <transition event="EntryValid" target="Ready">
        <action id="TripleBeep" />
        <action id="Unlock" />
      </transition>
      <transition event="EntryInvalid" target="Ready">
        <action id="ClearCodeEntryBuffer" />
        <action id="ErrorBeep" />
      </transition>
    </state>
</scxml>

  scxml2java translates this to a class named CodeEntry by scxml2java, intended
to be subclassed to handle the transition actions, and includes a debugging
mechanism.  scxml2dot translates the xml into a .dot graph description file for
rendering as an image (see attached code_entry.png)

  The motivation for designing the state machine in XML is for ease of
collaboration among various groups. Abstracting the basic elements of the state
machine masks the implementation details from design participants.