sgml2xml(1) on Linux
The text 6f59e2096390, as Debian 2.2 (Potato) shipped it.
convert SGML to XML An SGML System Conforming to International Standard ISO 8879 — Standard Generalized Markup Language
Flags it lists
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-C -
-D -
-b -
-c -
-e -
-f -
-i -
-v -
-w -
-x