bug#39663: [External] : bug#39663: 27.1; ebnf2ps bugs

[Drew Adams <drew.adams@oracle.com>]

> >> > (And does anyone use railway diagrams these days?)
> > Yes, docs still use railroad diagrams.
> 
> I'd be surprised if anything else ever used railroad diagrams, so this
> is not very helpful.  Which kinds of "docs" would use railroad diagrams?

1. There are websites (such as bottlecaps.de/rr/ui)
that let anyone create railroad diagrams, and they
let you do so with many different forms of BNF.
Why do they exist?

2. Here's one set of doc that uses both railroad
diagrams and BNF (which is both more accessible
and usable by code).  This page is just for the
syntax of a single (giant) command: CREATE TABLE.

https://docs.oracle.com/en/database/oracle/oracle-database/21/sqlrf/CREATE-TABLE.html#GUID-F9CE0CC3-13AE-4744-A43C-EAC7A71AAAB6

> > And EPS figures are still used in
> > technical doc production (of PDFs).
> 
> Embedded PDF seems to have completely replaced it around here.

OK! A sample of one.  What docs does "around here"
produce?  Is the syntax they document complex?
Are some of their users (doc readers) disinclined
to read other syntax spec presentations?