This file is indexed.

/usr/share/yelp/dtd/catalog is in yelp 3.10.2-0ubuntu1.

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 Entity Resolution XML Catalog 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">
  <rewriteSystem
      systemIdStartString="http://www.oasis-open.org/docbook/xml/4.1.2"
      rewritePrefix="/usr/share/yelp/dtd"/>
  <rewriteSystem
      systemIdStartString="http://www.oasis-open.org/docbook/xml/4.2"
      rewritePrefix="/usr/share/yelp/dtd"/>
  <rewriteSystem
      systemIdStartString="http://www.oasis-open.org/docbook/xml/4.3"
      rewritePrefix="/usr/share/yelp/dtd"/>
  <rewriteSystem
      systemIdStartString="http://www.oasis-open.org/docbook/xml/4.4"
      rewritePrefix="/usr/share/yelp/dtd"/>
  <rewriteSystem
      systemIdStartString="http://www.oasis-open.org/docbook/xml/4.5"
      rewritePrefix="/usr/share/yelp/dtd"/>
</catalog>