plugin.xml

   <!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
                      "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<!-- GDBus 2.32.3 -->
<node>
  <interface name="de.tvdr.vdr.plugin">
    <method name="SVDRPCommand">
      <arg type="s" name="command" direction="in">
      </arg>
      <arg type="s" name="option" direction="in">
      </arg>
      <arg type="i" name="replycode" direction="out">
      </arg>
      <arg type="s" name="replymessage" direction="out">
      </arg>
    </method>
    <method name="Service">
      <arg type="s" name="id" direction="in">
      </arg>
      <arg type="s" name="data" direction="in">
      </arg>
      <arg type="b" name="handled" direction="out">
      </arg>
    </method>
  </interface>
</node>