This file is indexed.

/etc/sgml/docbook-xml.cat is in docbook-xml 4.5-7.2.

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

The actual contents of the file can be viewed below.

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CATALOG /usr/share/xml/docbook/schema/dtd/catalog
CATALOG /usr/share/xml/docbook/schema/dtd/4.0/catalog
CATALOG /usr/share/xml/docbook/schema/dtd/4.1.2/catalog
CATALOG /usr/share/xml/docbook/schema/dtd/4.2/catalog
CATALOG /usr/share/xml/docbook/schema/dtd/4.3/catalog
CATALOG /usr/share/xml/docbook/schema/dtd/4.4/catalog
CATALOG /usr/share/xml/docbook/schema/dtd/4.5/catalog