Displaying sections in TOC

[JRancier@penntraffic.com]

How can show all 'section' elements
in my TOCs?  It appears that the default processing display two levels
of nested 'section' elements, but no deeper.  For example:

<chapter>
    <title>Chapter displays</title>
    <section>
        <title>This
section displays</title>
        <section>
           
<title>This section displays</title>
           
<section>
           
    <title>This section does NOT display</title>