/usr/share/xml/xgridfit/utils/convert-ttx.xsl is in xgridfit 2.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<!--
This script, called by ttx2xgf, converts a TTX file (an XML
representation of a font) into an Xgridfit script *almost* ready
to be compiled in TTX mode (final fixup is done in a Python
script).
-->
<xsl:output method="xml" encoding="UTF-8" indent="yes"/>
<xsl:variable name="newline">
<xsl:text>
</xsl:text>
</xsl:variable>
<xsl:variable name="newline-two">
<xsl:text>
</xsl:text>
</xsl:variable>
<xsl:variable name="newline-four">
<xsl:text>
</xsl:text>
</xsl:variable>
<xsl:variable name="newline-six">
<xsl:text>
</xsl:text>
</xsl:variable>
<xsl:variable name="two-space">
<xsl:text> </xsl:text>
</xsl:variable>
<xsl:variable name="four-space">
<xsl:text> </xsl:text>
</xsl:variable>
<xsl:template match="/">
<xsl:apply-templates/>
</xsl:template>
<xsl:template match="ttFont">
<xsl:element name="xgridfit" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:value-of select="$newline-two"/>
<xsl:element name="default" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="type">max-twilight-points</xsl:attribute>
<xsl:attribute name="value">
<xsl:value-of select="maxp/maxTwilightPoints/@value"/>
</xsl:attribute>
</xsl:element>
<xsl:value-of select="$newline-two"/>
<xsl:element name="default" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="type">legacy-storage</xsl:attribute>
<xsl:attribute name="value">
<xsl:value-of select="number(maxp/maxStorage/@value) + 64"/>
</xsl:attribute>
</xsl:element>
<xsl:value-of select="$newline-two"/>
<xsl:element name="default" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="type">max-stack</xsl:attribute>
<xsl:attribute name="value">
<xsl:value-of select="maxp/maxStackElements/@value"/>
</xsl:attribute>
</xsl:element>
<!-- Here are some handy values thrown in for free -->
<xsl:value-of select="$newline-two"/>
<xsl:element name="constant" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="name">left-sidebearing</xsl:attribute>
<xsl:attribute name="value">last + 1</xsl:attribute>
</xsl:element>
<xsl:value-of select="$newline-two"/>
<xsl:element name="constant" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="name">right-sidebearing</xsl:attribute>
<xsl:attribute name="value">last + 2</xsl:attribute>
</xsl:element>
<xsl:value-of select="$newline-two"/>
<xsl:element name="constant" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="name">vertical</xsl:attribute>
<xsl:attribute name="value">0</xsl:attribute>
</xsl:element>
<xsl:value-of select="$newline-two"/>
<xsl:element name="constant" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="name">horizontal</xsl:attribute>
<xsl:attribute name="value">1</xsl:attribute>
</xsl:element>
<xsl:value-of select="$newline-two"/>
<xsl:element name="constant" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="name">false</xsl:attribute>
<xsl:attribute name="value">0</xsl:attribute>
</xsl:element>
<xsl:value-of select="$newline-two"/>
<xsl:element name="constant" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="name">true</xsl:attribute>
<xsl:attribute name="value">1</xsl:attribute>
</xsl:element>
<xsl:apply-templates select="cvt"/>
<xsl:value-of select="$newline"/>
<xsl:apply-templates select="fpgm"/>
<xsl:value-of select="$newline"/>
<xsl:value-of select="$newline-two"/>
<xsl:element name="pre-program" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:value-of select="$newline"/>
<xsl:apply-templates select="prep"/>
<xsl:value-of select="$newline"/>
</xsl:element>
<xsl:value-of select="$newline"/>
<xsl:apply-templates select="glyf"/>
</xsl:element>
</xsl:template>
<xsl:template match="cvt">
<xsl:value-of select="$two-space"/>
<xsl:for-each select="cv">
<xsl:value-of select="$newline-two"/>
<xsl:element name="control-value" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="name">
<xsl:value-of select="concat('cv-',@index)"/>
</xsl:attribute>
<xsl:attribute name="value">
<xsl:value-of select="@value"/>
</xsl:attribute>
</xsl:element>
</xsl:for-each>
<xsl:value-of select="$newline-two"/>
<xsl:comment>
<xsl:text>
Do not add, subtract or reorder above this point.
You may change the id but not the value of any of
these control-value elements.
</xsl:text>
</xsl:comment>
<xsl:value-of select="$newline-two"/>
</xsl:template>
<xsl:template match="fpgm">
<xsl:if test="assembly">
<xsl:value-of select="$newline-two"/>
<xsl:element name="legacy-functions" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="max-function-defs">
<xsl:value-of select="/ttFont/maxp/maxFunctionDefs/@value"/>
</xsl:attribute>
<xsl:value-of select="$newline-six"/>
<xsl:value-of select="assembly"/>
<xsl:value-of select="$newline-two"/>
</xsl:element>
<xsl:value-of select="$newline"/>
<xsl:value-of select="$newline"/>
</xsl:if>
</xsl:template>
<xsl:template match="prep">
<xsl:if test="assembly">
<xsl:value-of select="$newline-two"/>
<xsl:value-of select="assembly"/>
</xsl:if>
<xsl:value-of select="$newline"/>
</xsl:template>
<xsl:template match="glyf">
<xsl:for-each select="TTGlyph">
<xsl:if test="instructions/assembly and
string-length(normalize-space(instructions/assembly))">
<xsl:value-of select="$newline-two"/>
<xsl:variable name="n">
<xsl:value-of select="./@name"/>
</xsl:variable>
<xsl:element name="glyph" namespace="http://xgridfit.sourceforge.net/Xgridfit2">
<xsl:attribute name="ps-name">
<xsl:value-of select="$n"/>
</xsl:attribute>
<xsl:attribute name="xml:id">
<xsl:choose>
<xsl:when test="$n = '.notdef'">
<xsl:text>notdef-glyph</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$n"/>
</xsl:otherwise>
</xsl:choose>
</xsl:attribute>
<xsl:attribute name="init-graphics">
<xsl:value-of select="'no'"/>
</xsl:attribute>
<xsl:value-of select="$newline-four"/>
<xsl:value-of select="instructions/assembly"/>
<xsl:value-of select="$newline-two"/>
</xsl:element>
<xsl:value-of select="$newline"/>
</xsl:if>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
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