Another oddity is this: even if I define a namespace prefix for the
Examples namespace:

xmlns:eg="http://www.tei-c.org/ns/Examples"

in the stylesheet root element, Saxon still uses the _0 prefix in the
output.

It's easy to cleanup with a regex search-and-replace, but it's really
annoying. There must be some way around it, otherwise people would be
asking this question all the time, surely? I assumed I'd just forgotten
something obvious or screwed something up.

<TEI xmlns="http://www.tei-c.org/ns/1.0" version="5.0">
[...]
<div>
<egXML xmlns="http://www.tei-c.org/ns/Examples" valid="true">
  For more information, consult the
  <ref target="mol:linking#linking_graphics"> guide to
  linking graphic content</ref>.</egXML>
</div>
[...]
</TEI>

<xsl:stylesheet version="2.0"
                xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="@* | node()">
  <xsl:copy>
    <xsl:apply-templates select="@* | node()"/>
  </xsl:copy>
</xsl:template>