*Title: TOC operator

*Original author: Bard Farstad

*Documentation:
'eztoc' is a template operator which generates a template table of contents
using the headers in an XML field.

The usage of the operator is as follows:

In the object template:

{* body is ezxml datatype*}
{eztoc( $node.object.data_map.body )}

This will produce the HTML output on the page (170 is an attribute ID):

<ul>
    <ul>
        <li><a href="#170_1">1. Quisque aliquet</a></li>
        <ul>
            <li><a href="#170_1_1">1.1 Cum sociis</a></li>
        </ul>
    </ul>
        <ul>
            <li><a href="#170_2">2. Quisque aliquet</a></li>
        <ul>
            <li><a href="#170_2_1">2.1 Cum sociis</a></li>
        </ul>
    </ul>
</ul>