the current element that matches the count pattern and that is a descendant of the anchor element.
 Each number is one plus the number of elder siblings of the relevant element that match the count pattern. The
 order of the numbers is "outwards-in".</td></tr></table>

<p>There is an optional <b>format</b> attribute which controls the output format. This contains an alternating
sequence of format-tokens and punctuation-tokens. A format-token is any sequence of alphanumeric characters,
a punctuation-to