This file is indexed.

/etc/sgml/docbook-simple.cat 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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CATALOG /usr/share/xml/docbook/custom/simple/1.0/catalog
CATALOG /usr/share/xml/docbook/custom/simple/1.1/catalog