title: Generate page citations with chapter numbers using DocBook/XLST-FO
body: <p>I'm able to generate a page number given an ID passed: <code>&lt;fo:page-number-citation ref-id="{$id}"/&gt;</code>.</p>
  
  <p>However, I'm unable to find a reliable way to fetch the chapter number.</p>
  
  <p>Ideally, I would like to have all calls to <code>fo:page-number-citation</code> to be of the format <strong>ChapterNum-PageNum</strong>.</p>