/usr/share/sgml/OpenJade/unicode/catalog is in openjade 1.4devel1-21.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"-//SGML Open:TR95xx//SYNTAX Extended (ISO/IEC 10646-1:1993 repertoire)//EN"
unicode.syn
SGMLDECL unicode.sd
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