xmlcatalog(1) on macOS
The text 0a7939329908, as Mac OS X 10.3.3, Mac OS X 10.3.2, Mac OS X 10.3.1, Mac OS X 10.3 shipped it.
Command line tool to parse and manipulate XML or SGML catalog files.
Flags it lists
-
--create -
--noout -
--sgml -
--shell -
--verbose -
-v