Revision control
++ <?xml version="1.0" encoding="UTF-8"?>
++ <scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0" initial="h">
++ <state id="b">
++ <history id="h">
++ <transition target="b2"/>
++ </history>
++
++ <state id="b2">
++ <onentry>
++ <assign location="x" expr="x * 5"/>
++ <log expr="'b2, x:' + x"/>
++ </onentry>
++ </state>
++ </state>
++ </scxml>