Revision control
++ <?xml version="1.0" ?>
++ <scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0"
++ initial="wrapper" name="CalculatortateMachine">
++ <state id="wrapper">
++ </state>
++ </scxml>
++ <?xml version="1.0" ?>
++ <scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0"
++ initial="wrapper" name="CalculatortateMachine">
++ <state id="wrapper">
++ </state>
++ </scxml>