/usr/lib/python3/dist-packages/lxml/isoschematron/resources/xsl/XSD2Schtrn.xsl is in python3-lxml 4.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
based on an original transform by Eddie Robertsson
2001/04/21 fn: added support for included schemas
2001/06/27 er: changed XMl Schema prefix from xsd: to xs: and changed to the Rec namespace
2009/12/10 hj: changed Schematron namespace to ISO URI (Holger Joukl)
-->
<xsl:transform version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:sch="http://purl.oclc.org/dsdl/schematron" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<!-- Set the output to be XML with an XML declaration and use indentation -->
<xsl:output method="xml" omit-xml-declaration="no" indent="yes" standalone="yes"/>
<!-- -->
<!-- match schema and call recursive template to extract included schemas -->
<!-- -->
<xsl:template match="xs:schema">
<!-- call the schema definition template ... -->
<xsl:call-template name="gatherSchema">
<!-- ... with current current root as the $schemas parameter ... -->
<xsl:with-param name="schemas" select="/"/>
<!-- ... and any includes in the $include parameter -->
<xsl:with-param name="includes"
select="document(/xs:schema/xs:*[self::xs:include or self::xs:import or self::xs:redefine]/@schemaLocation)"/>
</xsl:call-template>
</xsl:template>
<!-- -->
<!-- gather all included schemas into a single parameter variable -->
<!-- -->
<xsl:template name="gatherSchema">
<xsl:param name="schemas"/>
<xsl:param name="includes"/>
<xsl:choose>
<xsl:when test="count($schemas) < count($schemas | $includes)">
<!-- when $includes includes something new, recurse ... -->
<xsl:call-template name="gatherSchema">
<!-- ... with current $includes added to the $schemas parameter ... -->
<xsl:with-param name="schemas" select="$schemas | $includes"/>
<!-- ... and any *new* includes in the $include parameter -->
<xsl:with-param name="includes"
select="document($includes/xs:schema/xs:*[self::xs:include or self::xs:import or self::xs:redefine]/@schemaLocation)"/>
</xsl:call-template>
</xsl:when>
<xsl:otherwise>
<!-- we have the complete set of included schemas,
so now let's output the embedded schematron -->
<xsl:call-template name="output">
<xsl:with-param name="schemas" select="$schemas"/>
</xsl:call-template>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<!-- -->
<!-- output the schematron information -->
<!-- -->
<xsl:template name="output">
<xsl:param name="schemas"/>
<!-- -->
<sch:schema>
<!-- get header-type elements - eg title and especially ns -->
<!-- title (just one) -->
<xsl:copy-of select="$schemas//xs:appinfo/sch:title[1]"/>
<!-- get remaining schematron schema children -->
<!-- get non-blank namespace elements, dropping duplicates -->
<xsl:for-each select="$schemas//xs:appinfo/sch:ns">
<xsl:if test="generate-id(.) =
generate-id($schemas//xs:appinfo/sch:ns[@prefix = current()/@prefix][1])">
<xsl:copy-of select="."/>
</xsl:if>
</xsl:for-each>
<xsl:copy-of select="$schemas//xs:appinfo/sch:phase"/>
<xsl:copy-of select="$schemas//xs:appinfo/sch:pattern"/>
<sch:diagnostics>
<xsl:copy-of select="$schemas//xs:appinfo/sch:diagnostics/*"/>
</sch:diagnostics>
</sch:schema>
</xsl:template>
<!-- -->
</xsl:transform>
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