Revision control
++ <?xml version="1.0" encoding="UTF-8"?>
++ <scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0" name="TopMachine" datamodel="ecmascript">
++ <datamodel>
++ <data id="doneCounter" expr="0"/>
++ </datamodel>
++ <state id="topState">
++ <invoke type="scxml" id="submachine.1" src="file:submachineA.scxml"/>
++ <invoke type="scxml" id="submachine.2" src="file:submachineA.scxml"/>
++ <invoke type="scxml" id="submachine.3" src="file:submachineB.scxml"/>
++ <transition event="done.invoke">
++ <assign location="doneCounter" expr="doneCounter + 1"/>
++ <if cond="doneCounter === 3">
++ <send event="goToFinal" delay="1s"/>
++ </if>
++ </transition>
++ <transition event="goToFinal" target="finalState"/>
++ </state>
++ <final id="finalState"/>
++ </scxml>