+ <para>The <function>sd_bus_message_appendv()</function> is equivalent to
+ the function <function>sd_bus_message_append()</function>,
+ except that it is called with a <literal>va_list</literal> instead of
+ a variable number of arguments. This function does not call the
+ <function>va_end()</function> macro. Because it invokes the
+ <function>va_arg()</function> macro, the value of ap
+ is undefined after the call.</para>
+