test.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-model href="http://docbook.org/xml/5.1/rng/docbook.rng" 
  schematypens="http://relaxng.org/ns/structure/1.0"?>
<?xml-model href="http://docbook.org/xml/5.1/sch/docbook.sch" 
  type="application/xml" schematypens="http://purl.oclc.org/dsdl/schematron"?>
<section xmlns="http://docbook.org/ns/docbook"
  xmlns:xlink="http://www.w3.org/1999/xlink" version="5.1">
  <title>Title with <emphasis role="nonbold">highlighting </emphasis>in it</title>
  <para>More <phrase role="foo">inline markup </phrase>with<emphasis>
      different whitespace </emphasis>situations. </para>
  <para><emphasis>Nested <phrase><glossterm>phrases </glossterm>with
      </phrase>whitespace </emphasis>in it.</para>
  <para>Leading spaces<phrase> don’t occur as frequently<emphasis>
        as</emphasis> trailing ones </phrase>in common <glossterm>word
      processor </glossterm>/ <glossterm>DTP </glossterm>output. There’s
    a non-breaking space after <emphasis>“word processor.” </emphasis>Can
    we expect the <glossterm>authors</glossterm> /
      <glossterm>typesetters </glossterm>to place them consciously
    outside the highlighted term? I think we’ll include <code>\p{Zs}</code>
  in the <glossterm>regular expression,</glossterm> too.</para>
  <para><link xlink:href="https://en.wikipedia.org/wiki/Hyperlink"
        ><emphasis>Link text </emphasis></link>should be<phrase>
      space-normalized, </phrase>too. And in most cases where whitespace
    normalization is required, there should also be no punctuation
    within the highlighted <emphasis>segments.</emphasis>
    <emphasis>(although it might be desirable for typographic
      reasons)</emphasis>.</para>
  <para>Footnote impose an entirely new class of problems, particularly
    if they are placed within a <phrase>phrase<footnote>
        <para>This footnote ends with whitespace. It also contains
          ignorable WS after this para. The WS should <emphasis>not
          </emphasis>be naïvely pulled out of the footnote and placed
          after the surrounding phrase. </para></footnote></phrase>.</para>
</section>