 input source stream that corresponds to a given
        element in the AST.
      </p>
<p>
        In addition, This example also shows how to "inject" client data,
        using the "with" directive, that the <code class="computeroutput"><span class="identifier">on_success</span></code>
        handler can access as it is called within the parse traversal through the
        parser's context.
      </p>
<p>
        The full cpp file for this example can be found here: <a href="../../../../../example/x3/an