This file is indexed.

/etc/sgml/docbook-dsssl.cat is in docbook-dsssl 1.79-9.1.

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

The actual contents of the file can be viewed below.

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CATALOG /usr/share/sgml/docbook/stylesheet/dsssl/modular/catalog
CATALOG /usr/share/sgml/docbook/stylesheet/dsssl/modular/common/catalog