Revision control
++ <?xml version="1.0" encoding="UTF-8"?>
++ <scxml
++ xmlns="http://www.w3.org/2005/07/scxml"
++ version="1.0"
++ >
++ <state id="anyplace">
++ <state id="somewhere">
++ <invoke type="http://www.w3.org/TR/scxml/">
++ <content>
++ <!-- <scxml name="anywhere" version="1.0">
++ <state id="here">
++ <transition event="goThere" target="there"/>
++ </state>
++ <state id="there">
++ <transition event="goHere" target="here"/>
++ </state>
++ </scxml>
++ </content>
++ </invoke>
++ </state>
++ </state>
++ </scxml>