This file is indexed.

/usr/share/xml/docbook/custom/simple/1.0/catalog.xml is in docbook-simple 1.1-4.2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0"?>
<!DOCTYPE catalog PUBLIC "-//OASIS//DTD XML Catalogs V1.0//EN"
     "http://www.oasis-open.org/committees/entity/release/1.0/catalog.dtd">

<catalog xmlns="urn:oasis:names:tc:entity:xmlns:xml:catalog" prefer="public">

<!-- ..................................................................... -->
<!-- This catalog was written for the Debian system. ..................... -->
<!-- ..................................................................... -->

<!-- ..................................................................... -->
<!-- catalog entry for docbook docbook-simple v1.0 ....................... -->
<public publicId="-//OASIS//DTD Simplified DocBook XML V1.0//EN"
        uri="sdocbook.dtd"/>
<system systemId="http://www.oasis-open.org/docbook/xml/simple/1.0/sdocbook.dtd"
        uri="sdocbook.dtd"/>
<system systemId="http://docbook.org/xml/simple/1.0/sdocbook.dtd"
	uri="sdocbook.dtd"/>

<public publicId="-//OASIS//DTD Simplified DocBook XML Customization V1.0//EN"
        uri="sdocbook-custom.dtd"/>
<system systemId="http://www.oasis-open.org/docbook/xml/simple/1.0/sdocbook-custom.dtd"
        uri="sdocbook-custom.dtd"/>
<system systemId="http://docbook.org/xml/simple/1.0/sdocbook-custom.dtd"
	uri="sdocbook-custom.dtd"/>

<public publicId="-//OASIS//DTD Simplified DocBook RefEntry XML V1.0//EN"
        uri="sdocbookref.dtd"/>
<system systemId="http://www.oasis-open.org/docbook/xml/simple/1.0/sdocbookref.dtd"
        uri="sdocbookref.dtd"/>
<system systemId="http://docbook.org/xml/simple/1.0/sdocbookref.dtd"
	uri="sdocbookref.dtd"/>

<public publicId="-//OASIS//DTD Simplified DocBook RefEntry XML Customization V1.0//EN" 
        uri="sdocbookref-custom.dtd"/>
<system systemId="http://www.oasis-open.org/docbook/xml/simple/1.0/sdocbookref-custom.dtd"
        uri="sdocbookref-custom.dtd"/>
<system systemId="http://docbook.org/xml/simple/1.0/sdocbookref-custom.dtd"
	uri="sdocbookref.dtd"/>

</catalog>