xmlcatalog(1) on macOS
The text 737bbfb3ae9e, as Mac OS X 10.3.8, Mac OS X 10.3.7, Mac OS X 10.3.6, Mac OS X 10.3.5, Mac OS X 10.3.4 shipped it.
Command line tool to parse and manipulate XML or SGML catalog files.
Flags it lists
-
--create -
--noout -
--sgml -
--shell -
--verbose -
-v