Revision control
++ <?xml version="1.0" encoding="UTF-8"?>
++ <protocol name="example_shell">
++ <copyright>
++ Copyright (C) 2021 The Qt Company Ltd.
++ SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++ </copyright>
++
++ <interface name="qt_example_shell_surface" version="1">
++ <request name="destroy" type="destructor">
++ </request>
++
++ <request name="set_window_title">
++ <arg name="window_title" type="string" />
++ </request>
++
++ <request name="set_minimized">
++ <arg name="minimized" type="uint" />
++ </request>
++ <event name="minimize">
++ <arg name="minimized" type="uint"/>
++ </event>
++ </interface>
++
++ <interface name="qt_example_shell" version="1">
++ <request name="surface_create">
++ <arg name="surface" type="object" interface="wl_surface"/>
++ <arg name="id" type="new_id" interface="qt_example_shell_surface"/>
++ </request>
++ <enum name="error">
++ <entry name="role" value="0" summary="wl_surface already has a different role"/>
++ </enum>
++ </interface>
++
++ </protocol>