/usr/share/sgml/entities/ArborText/catalog is in sgml-data 2.0.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | -- public identifiers override system identifiers, if both are supplied --
OVERRIDE YES
PUBLIC "-//ArborText//ENTITIES Equation1//EN" ATIeqn1
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