Handle SGML variant as well as XML variant. SGML is *much* more
likely to be used.
diff --git a/Doc/tools/sgmlconv/fixgenents.sh b/Doc/tools/sgmlconv/fixgenents.sh
index 0503d7b..fc825c8 100755
--- a/Doc/tools/sgmlconv/fixgenents.sh
+++ b/Doc/tools/sgmlconv/fixgenents.sh
@@ -29,5 +29,17 @@
s|<geq/>|\≥|g
s|<ldots/>|\&hellip|g
s|<leq/>|\≤|g
+s|<ABC>|\&ABC;|g
+s|<ASCII>|\&ASCII;|g
+s|<C>|\&C;|g
+s|<Cpp>|\&Cpp;|g
+s|<EOF>|\&EOF;|g
+s|<NULL>|\&NULL;|g
+s|<POSIX>|\&POSIX;|g
+s|<UNIX>|\&UNIX;|g
+s|<e>|\\|g
+s|<geq>|\≥|g
+s|<ldots>|\&hellip|g
+s|<leq>|\≤|g
s|---|\—|g
' || exit $?