/usr/share/yelp-xsl/xslt/docbook/html/db2html-math.xsl is in yelp-xsl 3.10.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option) any
later version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
details.
You should have received a copy of the GNU Lesser General Public License
along with this program; see the file COPYING.LGPL. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
-->
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:db="http://docbook.org/ns/docbook"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns="http://www.w3.org/1999/xhtml"
exclude-result-prefixes="db mml xlink"
version="1.0">
<!--!!==========================================================================
DocBook to HTML - MathML
Handle MathML in DocBook documents.
:Revision: version="3.8" date="2012-11-13" status="final"
This stylesheet matches embedded MathML and processes it in %{db2html.math.mode}.
The matched templates for the #{mml:math} element automatically set the #{display}
attribute based on whether the element is in block or inline context.
-->
<!--**==========================================================================
db2html.math.div
Output an HTML #{div} element and block-level MathML.
:Revision:version="3.8" date="2012-11-13" status="final"
$node: The #{mml:math} element to render.
This template creates an HTML #{div} element for a MathML #{mml:math} element,
then outputs MathML content. It sets the #{display} attribute on the output to
#{"block"} and applies %{db2html.math.mode} to the child content.
-->
<xsl:template name="db2html.math.div">
<xsl:param name="node" select="."/>
<div>
<xsl:call-template name="html.class.attr">
<xsl:with-param name="node" select="$node"/>
<xsl:with-param name="class" select="'math'"/>
</xsl:call-template>
<xsl:call-template name="html.lang.attrs">
<xsl:with-param name="node" select="$node"/>
</xsl:call-template>
<xsl:element name="math" namespace="{$html.mathml.namespace}">
<xsl:for-each select="$node/@*[name(.) != 'display']">
<xsl:copy-of select="."/>
</xsl:for-each>
<xsl:attribute name="display">
<xsl:value-of select="'block'"/>
</xsl:attribute>
<xsl:apply-templates mode="db2html.math.mode" select="$node/node()"/>
</xsl:element>
</div>
</xsl:template>
<!--**==========================================================================
db2html.math.span
Output an HTML #{span} element and inline MathML.
:Revision:version="3.8" date="2012-11-13" status="final"
$node: The #{mml:math} element to render.
This template creates an HTML #{span} element for a MathML #{mml:math} element,
then outputs MathML content. It sets the #{display} attribute on the output to
#{"inline"} and applies %{db2html.math.mode} to the child content.
-->
<xsl:template name="db2html.math.span">
<xsl:param name="node" select="."/>
<span class="math">
<xsl:call-template name="html.lang.attrs">
<xsl:with-param name="node" select="$node"/>
</xsl:call-template>
<xsl:element name="math" namespace="{$html.mathml.namespace}">
<xsl:for-each select="$node/@*[name(.) != 'display']">
<xsl:copy-of select="."/>
</xsl:for-each>
<xsl:attribute name="display">
<xsl:value-of select="'inline'"/>
</xsl:attribute>
<xsl:apply-templates mode="db2html.math.mode" select="$node/node()"/>
</xsl:element>
</span>
</xsl:template>
<!--%%==========================================================================
db2html.math.mode
Output MathML and handle Mallard extension.
:Revision: version="3.8" date="2012-11-13" status="final"
This mode is used for processing MathML embedded into DocBook documents. For
most types of MathML content, it simply copies the input directly, except it
outputs the MathML in a way that allows the namespace to stripped for non-XML
output. It converts #{xlink:href} attributes from MathML 2 to #{href} attributes
for MathML 3.
-->
<xsl:template mode="db2html.math.mode" match="mml:*">
<xsl:element name="{local-name(.)}" namespace="{$html.mathml.namespace}">
<xsl:for-each select="@*[name(.) != 'href']">
<xsl:copy-of select="."/>
</xsl:for-each>
<xsl:choose>
<xsl:when test="@href">
<xsl:copy-of select="@href"/>
</xsl:when>
<xsl:when test="@xlink:href">
<xsl:attribute name="href">
<xsl:value-of select="@xlink:href"/>
</xsl:attribute>
</xsl:when>
</xsl:choose>
<xsl:apply-templates mode="db2html.math.mode"/>
</xsl:element>
</xsl:template>
<xsl:template mode="db2html.math.mode" match="text()">
<xsl:value-of select="."/>
</xsl:template>
<xsl:template mode="db2html.math.mode" match="*"/>
<!-- == Matched Templates == -->
<xsl:template match="equation/mml:math | informalequation/mml:math |
db:equation/mml:math | db:informalequation/mml:math">
<xsl:call-template name="db2html.math.div"/>
</xsl:template>
<xsl:template match="inlineequation/mml:math | db:inlineequation/mml:math">
<xsl:call-template name="db2html.math.span"/>
</xsl:template>
<xsl:template match="db:imagedata[@format='mathml']/mml:math">
<xsl:variable name="media" select="(ancestor::db:mediaobject[1] |
ancestor::db:inlinemediaobject[1]
)[last()]"/>
<xsl:choose>
<xsl:when test="local-name($media) = 'inlinemediaobject'">
<xsl:call-template name="db2html.math.span"/>
</xsl:when>
<xsl:otherwise>
<xsl:call-template name="db2html.math.div"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
</xsl:stylesheet>
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