Sample FO result tree

<?xml version="1.0" encoding="utf-8"?>
<fo:root xmlns:fo="http://www.w3.org/1999/XSL/Format">
...
<fo:page-sequence>
  <fo:flow>
    <fo:block font-size="18pt" font-weight="bold"
              text-align="centered">
      Preface
    </fo:block>
    <fo:block font-size="12pt" space-before="1pc"
              text-align="justified">
      This is a simple test document.  It shows a 
      <fo:inline font-style="italic">partial</fo:inline>
      fo-result tree (page layout missing).
    </fo:block>
  </fo:flow>
</fo:page-sequence>
...
</fo:root>