/usr/share/sgml/dtd/xml-core/catalog is in xml-core 0.13+nmu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- TR 9401 catalog registration for the XML Catalog DTD --
-- ...................................................................... --
-- ...................................................................... --
-- public identifiers override system identifiers, if both are supplied --
OVERRIDE YES
-- ...................................................................... --
PUBLIC "-//OASIS//DTD XML Catalogs V1.0//EN" catalog.dtd
DTDDECL "-//OASIS//DTD XML Catalogs V1.0//EN" /usr/share/sgml/declaration/xml.dcl
-- ...................................................................... --
PUBLIC "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" catalog.dtd
DTDDECL "-//OASIS//DTD Entity Resolution XML Catalog V1.0//EN" /usr/share/sgml/declaration/xml.dcl
-- ...................................................................... --
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