n on the process dictionary of the current process.</td></tr>
<tr><td valign="top"><a href="#start-2">start/2</a></td><td>start a new span on the process dictionary of the current process
  with an existing trace id or with a parent span.</td></tr>
<tr><td valign="top"><a href="#start-3">start/3</a></td><td>start a new span on the process dictionary of the current process
  with an existing trace id and parent id.</td></tr>
<tr><td valign="top"><a href="#start_with_tags-2">start_with_tags/2</a></td><td>star