[docbook-apps] webhelp javascript error

[natk]

I have encountered the following javascript error in webhelp:

Uncaught Error: Syntax error, unrecognized expression: [name=section4.id]

This only happens when I have a section which is four levels deep or more
and I have given the section a manually generated id (i.e. it is a section
to which I want to refer via an xref) which contains a dot(.) character.

The error occurs when I click on the section in question in the navigation
sidebar.

My browser reports that the problem is in:

jquery-1.7.2.min.js:3

This is a docbook sample which demonstrates the problem:

<?xml version="1.0"?>
<book id="DocId" xmlns="http://docbook.org/ns/docbook";>

  <title>Document Title</title>
  <chapter><title>Chapter</title>
    <section><title>Section Level 1</title>
      <section><title>Section Level 2</title>
        <section><title>Section Level 3</title>
          <section><title>Section Level 4</title>
          </section>
        </section>
      </section>

      <section id="section2.id"><title>Section Level 2 with ID</title>
        <section id="section3.id"><title>Section Level 3 with ID</title>
          <section id="section4.id"><title>Section Level 4 with ID</title>
            <para>And finally some text.</para>
          </section>
        </section>
      </section>

      <section id="section2id"><title>Section Level 2 with ID (no
dot)</title>
        <section id="section3id"><title>Section Level 3 with ID (no
dot)</title>
          <section id="section4id"><title>Section Level 4 with ID (no
dot)</title>
            <para>And some more text.</para>
          </section>
        </section>
      </section>
    </section>
  </chapter>
</book>

It doesn't seem to like manually generated 'id's with the dot character in
them.

Has anyone else found this? Is this a limitation of this format? Are there
any other characters which are not permitted? Is it confusing the string
literal for a regexp?

Nat