This file is indexed.

/usr/share/libreoffice/help/idxcaption.xsl is in libreoffice-common 1:3.5.7-0ubuntu13.

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 version="1.0" encoding="UTF-8"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:office="http://openoffice.org/2000/office"
	xmlns:style="http://openoffice.org/2000/style"
	xmlns:table="http://openoffice.org/2000/table"
	xmlns:draw="http://openoffice.org/2000/drawing"
	xmlns:fo="http://www.w3.org/1999/XSL/Format"
	xmlns:xlink="http://www.w3.org/1999/xlink"
	xmlns:dc="http://purl.org/dc/elements/1.1/"
	xmlns:meta="http://openoffice.org/2000/meta"
	xmlns:number="http://openoffice.org/2000/datastyle"
	xmlns:svg="http://www.w3.org/2000/svg"
	xmlns:chart="http://openoffice.org/2000/chart"
	xmlns:help="http://openoffice.org/2000/help"
	xmlns:index="http://sun.com/2000/XMLSearch"	
	xmlns:text="http://openoffice.org/2000/text">

<xsl:param name="Language" select="'en-US'"/>
<xsl:output method="text" encoding="UTF-8"/>

<xsl:template match="/">
	<xsl:apply-templates select="//title" mode="include"/>
	<xsl:apply-templates select="//paragraph[@role='heading']" mode="include"/>
</xsl:template>

<xsl:template match="*" mode="include">
	<xsl:value-of select="."/>
	<xsl:text>&#xA;</xsl:text>
</xsl:template>

<xsl:template match="*"/>

</xsl:stylesheet>