Revision control
++ <?xml version="1.0" encoding="utf-8" ?>
++ <QHelpCollectionProject version="1.0">
++ <docFiles>
++ <generate>
++ <file>
++ <input>wateringmachine.qhp</input>
++ <output>wateringmachine.qch</output>
++ </file>
++ </generate>
++ <register>
++ <file>wateringmachine.qch</file>
++ </register>
++ </docFiles>
++ </QHelpCollectionProject>