Ok I understood what I didn't understood before, I'm trying to make it good
and I write back either the solution I found or maybe other problems I
encountered
indeed I encountered other problems :
- In the recursive template, there's a problem at the last loop cause
substring-before the space is empty, but I found a solution
- there's also the problem of double matched THEME, because they have many
correspondings strings in label attribute
- How to highlight the searched string while displaying the label attribute
of the THEME elements matched.

So I'm working on it (it's about to be over) and come back in a while...

best,
-Rob