Rendering problem with <question>

[Warren Block]

There is a question and answer section at the end of the Rebuilding 
"world" section of the Handbook:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/makeworld.html#Q25.7.14.1.

Note how the first question is shown.  Now look at the next question: 
the question text is not shown, just the number.  The DocBook source for 
that question:

   <question>
     <indexterm><primary>signal 11</primary></indexterm>

     <para>My compile failed with lots of signal 11 (or other signal
       number) errors.  What has happened?</para>
   </question>

It appears the renderer is being confused by the <indexterm>, which it 
should ignore.