Revision control
++ <?xml version="1.0" ?>
++ <!--
++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++ -->
++ <scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0"
++ name="super_state_machine">
++ <parallel id="super_top">
++ <state id="a">
++ <invoke>
++ <content>
++ <scxml xmlns="http://www.w3.org/2005/07/scxml" version="1.0"
++ name="sub_state_machine">
++ <state id="sub_top"/>
++ </scxml>
++ </content>
++ </invoke>
++ </state>
++ <state id="b"/>
++ </parallel>
++ </scxml>