> Here is a way way to combine the output with a name/caption.

Slight modification : caption in emacs-lisp (to avoid sh blocks) : see the enclosed archive (necessary to avoid anti-spam blocking by my ISP).

Mixed results (see enclosed archive):

- ODT exports : I get a captioned block containing the equation, correctly referenced.

- HTML : I get the equation (via MathML/Mathjax), no caption and a reference to nothing visible.

- PDF via LaTeX : I get the math and an undefined reference (??).

- Docx from ODT : mangled math, unrelated caption, reference to nothing.

There is a nice idea, but it is still perfectible. I'm afraid that filering by exporter is still necessary...

Thank you again !

--
Emmanuel Charpentier