nsgmls(1) on Linux
The text aa147865d8cd, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge), Debian 3.0 (Woody) shipped it.
a validating SGML parser An SGML System Conforming to International Standard ISO 8879 — Standard Generalized Markup Language
Flags it lists
-
-B -
-C -
-D -
-E -
-a -
-b -
-d -
-data -
-e -
-f -
-g -
-i -
-l -
-m -
-o -
-p -
-r -
-s -
-t -
-u -
-v -
-w