/usr/share/xml/docbook/schema/dtd/4.4/catalog is in docbook-xml 4.5-7ubuntu1.
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 data for DocBook XML V4.4 .................................... --
-- File docbook.cat ..................................................... --
-- Please direct all questions, bug reports, or suggestions for
changes to the docbook@lists.oasis-open.org mailing list. For more
information, see http://www.oasis-open.org/.
--
-- This is the catalog data file for DocBook XML V4.4. It is provided as
a convenience in building your own catalog files. You need not use
the filenames listed here, and need not use the filename method of
identifying storage objects at all. See the documentation for
detailed information on the files associated with the DocBook DTD.
See SGML Open Technical Resolution 9401 for detailed information
on supplying and using catalog data.
--
-- public identifiers override system identifiers, if both are supplied --
OVERRIDE YES
-- ...................................................................... --
-- DocBook driver file .................................................. --
PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"docbookx.dtd"
SYSTEM "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd"
"docbookx.dtd"
SYSTEM "http://docbook.org/xml/4.4/docbookx.dtd"
"docbookx.dtd"
DTDDECL "-//OASIS//DTD DocBook XML V4.4//EN"
"/usr/share/xml/declaration/xml.dcl"
-- ...................................................................... --
-- DocBook modules ...................................................... --
PUBLIC "-//OASIS//DTD DocBook CALS Table Model V4.4//EN"
"calstblx.dtd"
PUBLIC "-//OASIS//ELEMENTS DocBook XML HTML Tables V4.4//EN"
"htmltblx.mod"
PUBLIC "-//OASIS//DTD XML Exchange Table Model 19990315//EN"
"soextblx.dtd"
PUBLIC "-//OASIS//ELEMENTS DocBook Information Pool V4.4//EN"
"dbpoolx.mod"
PUBLIC "-//OASIS//ELEMENTS DocBook Document Hierarchy V4.4//EN"
"dbhierx.mod"
PUBLIC "-//OASIS//ENTITIES DocBook Additional General Entities V4.4//EN"
"dbgenent.mod"
PUBLIC "-//OASIS//ENTITIES DocBook Notations V4.4//EN"
"dbnotnx.mod"
PUBLIC "-//OASIS//ENTITIES DocBook Character Entities V4.4//EN"
"dbcentx.mod"
-- End of catalog data for DocBook XML V4.4 ............................. --
-- ...................................................................... --
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