[O] change tables to matrix when importing, including expressions.

[Uwe Brauer]

Hi

I know that 
#+begin_src 
#+attr_latex: :mode math :environment matrix
| 0 | -5 |
| 5 |  0 |
#+end_src

Results in 


#+begin_src 
\[
\begin{matrix}
 0 & -5 \\
 5 & 0 \\
\end{matrix}
\]
#+end_src


However I would like 
#+begin_src 
#+attr_latex: :mode math :environment matrix
D=
| 0 | -5 |
| 5 |  0 |
#+end_src

To be exported as 

#+begin_src 
\[
D=
\begin{matrix}
 0 & -5 \\
 5 & 0 \\
\end{matrix}
\]
#+end_src

How can I do that? 

Thanks and regards

Uwe Brauer