Your comments

I have the same problem. You don't even need to have xml in your cdata section.

I see it with this : I cannot fold the "elt" element (more exactly, the code within the element is folded, but only up to the "aaa" line).

If i add a space or a tab before aaa, it works again, it folds correctly. If I remove the blank line on the second line, I don't even have the arrow to fold the code "elt" element