[xsl] Unwanted namespace prefix _0

[Martin Holmes <mholmes@xxxxxxx>]

Hi all,

I'm doing an identity transform with Saxon 9.5.1.2 (HE, PE and EE all do 
the same) on a TEI file with embedded examples in the Examples namespace:

<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>

In the output, Saxon generates unwanted namespace prefixes, like this:

<_0:egXML xmlns:_0="http://www.tei-c.org/ns/Examples"; valid="true">
  For more information, consult the
  <_0:ref target="mol:linking#linking_graphics"> guide to
  linking graphic content</_0:ref>.</_0:egXML>

This is even though I have exclude-result-prefixes="#all", and it 
happens whether or not I define a prefix in the root stylesheet element 
for the Examples namespace.

What am I missing? How would I get output that looks exactly like the input?

Cheers,
martin