/usr/share/sgml-base/transitional.cat is in sgml-base 1.26+nmu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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## ======================================================================
## /usr/lib/sgml/transitional.cat : SGML Open style entity catalog
## ======================================================================
## Please use install-sgmlcatalog(8) to modify this file.
## ======================================================================
--
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