Revision control
++ <?xml version="1.0" encoding="UTF-8"?>
++ <!--
++ initial: [b1,b2]
++ after t: [d]
++ -->
++ <scxml
++ datamodel="ecmascript"
++ xmlns="http://www.w3.org/2005/07/scxml"
++ version="1.0"
++ initial="a">
++
++ <state id="a" initial="b">
++
++ <parallel id="b">
++ <state id="b1">
++ <transition event="t" target="d"/>
++ </state>
++
++ <state id="b2">
++ <transition event="t" target="c"/>
++ </state>
++
++ </parallel>
++
++ <parallel id="c">
++ <state id="c1">
++ </state>
++
++ <state id="c2">
++ </state>
++ </parallel>
++
++ </state>
++
++ <state id="d"/>
++
++ </scxml>