/usr/share/xml/xhtml/schema/dtd/1.0/catalog is in w3c-dtd-xhtml 1.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- Oasis entity catalog for Extensible HTML 1.0 --
PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "xhtml1-strict.dtd"
DTDDECL "-//W3C//DTD XHTML 1.0 Strict//EN" "xhtml1.dcl"
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd"
DTDDECL "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1.dcl"
PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "xhtml1-frameset.dtd"
DTDDECL "-//W3C//DTD XHTML 1.0 Frameset//EN" "xhtml1.dcl"
-- ISO latin 1 entity set for Extensible HTML (XML 1.0 format) --
-- The entities are stored in another directory --
-- PUBLIC "-//W3C//ENTITIES Latin 1 for XHTML//EN" "xhtml-lat1.ent" --
-- PUBLIC "-//W3C//ENTITIES Symbols for XHTML//EN" "xhtml-symbol.ent" --
-- PUBLIC "-//W3C//ENTITIES Special for XHTML//EN" "xhtml-special.ent" --
-- Replaced by the DTDDECL above --
-- SGMLDECL "xhtml1.dcl" --
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