LrXML xsl transform cannot match document node on windows

Question

On windows the xsl library used has a bug which is preventing it from matching the document node (the parent of the root element of the document).
I reduced this to a test case:
xml data:
<first>
  <second />
</first>
xsl stylesheet:
<xsl:stylesheet version='1.0' xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method='text'/>
  <xsl:template match='/'>ROOT<xsl:apply-templates/></xsl:template>
  <xsl:template match='first'>FIRST<xsl:apply-templates/></xsl:template>
  <xsl:template match='second'>SECOND<xsl:apply-templates/></xsl:template>
</xsl:stylesheet>
The output should be ROOTFIRSTSECOND and this is the observed output if this stylesheet is processed by msxsl or xsltproc. The problem is, when this is processed by LrXML on windows the output is FIRSTSECOND.
Granted I am not an xsl expert but to the best of my knowledge this looks like a bug. Any chance this can be fixed?
Cheers.

Answer 1

I used process explorer and found that in my case Lightroom uses msxml3.dll. I also ran msxml.exe -u 3.0 which selects the same dll for processing and verified that msxml.exe gives different results that Lightroom.
Here's the code I am running. In Info.lua:
  LrExportMenuItems = {
      title = 'Test XSLT',
      file = 'TestXSLT.lua'
and in TestXSLT.lua:
local logger = import('LrLogger')()
logger:enable('logfile')
local LrXml = import('LrXml')
local utils = require('utils')
local xml_data = [[
<?xml version='1.0' encoding='UTF-8'?>
<first>
  <second />
</first>
local xslt_data = [[
<xsl:stylesheet version='1.0' xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method='text'/>
  <xsl:template match='/'>ROOT<xsl:apply-templates/></xsl:template>
  <xsl:template match='first'>FIRST<xsl:apply-templates/></xsl:template>
  <xsl:template match='second'>SECOND<xsl:apply-templates/></xsl:template>
</xsl:stylesheet>
logger:debug('Parsing xml: ' .. xml_data)
local xml = LrXml.parseXml(xml_data)
logger:debug('Applying xslt: ' .. xslt_data)
local res = xml:transform(xslt_data)
logger:debug('Result: ' .. res)
Can you please try and verify that it is broken for you as well?
Thank you.
Fixed code formatting. disht