> [snip]


> This is morally equivalent:


> #+attr_latex: :mode math :math-prefix D= :environment matrix
> | 0 | -5 |
> | 5 |  0 |


> There will be no newline between the '=' and the '\begin'. If that is
> something you truly need you will have to add a filter. See (info
> "(org) Advanced Export Configuration").

It is very useful, thanks a lot.

The missing newline is a bit annoying but no catastrophe.