URL: <https://savannah.gnu.org/bugs/?68499>
Summary: [PATCH] [eqn] use XML character references in MathML
output
Group: GNU roff
Submitter: gbranden
Submitted: Sat 04 Jul 2026 11:42:57 AM UTC
Category: Preprocessor eqn
Severity: 1 - Wish
Item Group: Feature change
Status: None
Privacy: Public
Assigned to: gbranden
Open/Closed: Open
Discussion Lock: Unlocked
Planned Release: None
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Follow-up Comments:
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Date: Sat 04 Jul 2026 11:42:57 AM UTC By: G. Branden Robinson <gbranden>
> I'm using eqn to generate my personal website and in Atom web feeds, only
> four named entities (lt gt amp quot) are widely supported, while numerical
> character references(&#...;) always work.
See:
https://lists.gnu.org/archive/html/groff/2026-03/msg00109.html
https://lists.gnu.org/archive/html/groff/2026-03/msg00108.html
https://lists.gnu.org/archive/html/groff/2026-03/msg00113.html (patch v2)
At the very least, we need to do something about this:
https://lists.gnu.org/archive/html/groff/2026-04/msg00011.html
$ printf '.EQ\napprox\n.EN\n' | ./eqn -TMathML
.do if !dEQ .ds EQ
.do if !dEN .ds EN
.EQ
<math><mtext>\(~=</mtext></math>
.EN
Possibly a separate issue/ticket: support for GNU troff-style Unicode special
character escape sequences in eqn when outputting MathML.
https://lists.gnu.org/archive/html/groff/2026-03/msg00116.html
https://lists.gnu.org/archive/html/groff/2026-04/msg00009.html
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