Revision control
++ <?xml version="1.0"?>
++ <!-- when invoked, just terminate. -->
++
++
++ <scxml initial="final" version="1.0" datamodel="ecmascript" xmlns="http://www.w3.org/2005/07/scxml" xmlns:conf="http://www.w3.org/2005/scxml-conformance">
++
++ <final id="final"/>
++
++ </scxml>