Revision control
++ <?xml version="1.0" encoding="UTF-8"?>
++ <scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0" binding="early" xmlns:qt="http://www.qt.io/2015/02/scxml-ext" name="HistoryState" qt:editorversion="4.9.0">
++ <state id="Off">
++ <transition type="external" event="toOn" target="On">
++ </transition>
++ <transition type="external" event="toHistory" target="History_1">
++ </transition>
++ <onentry>
++ <log label="Off" expr="onentry"/>
++ </onentry>
++ <onexit>
++ <log label="Off" expr="onexit"/>
++ </onexit>
++ </state>
++ <state id="On" initial="Beta">
++ <state id="Alpha">
++ <transition type="external" event="toBeta" target="Beta">
++ </transition>
++ <onentry>
++ <log label="Alpha" expr="onentry"/>
++ </onentry>
++ <onexit>
++ <log label="Alpha" expr="onexit"/>
++ </onexit>
++ </state>
++ <state id="Beta">
++ <transition type="external" event="toDelta" target="Delta">
++ </transition>
++ <onentry>
++ <log label="Beta" expr="onentry"/>
++ </onentry>
++ <onexit>
++ <log label="Beta" expr="onexit"/>
++ </onexit>
++ </state>
++ <history type="shallow" id="History_1">
++ </history>
++ <state id="Delta">
++ <transition type="external" event="toAlpha" target="Alpha">
++ </transition>
++ <onentry>
++ <log label="Delta" expr="onentry"/>
++ </onentry>
++ <onexit>
++ <log label="Delta" expr="onexit"/>
++ </onexit>
++ </state>
++ <transition type="external" event="toOff" target="Off">
++ </transition>
++ <onentry>
++ <log label="On" expr="onentry"/>
++ </onentry>
++ <onexit>
++ <log label="On" expr="onexit"/>
++ </onexit>
++ </state>
++ </scxml>