[Zope] Sequence number inside a tree

[Alfredo P. Ricafort]

Hi,

Is there a way to generate a sequence number inside a <dtml-tree> or
replace the + sign with a sequence number? 

What I wanted to do is something like this:

1. Branch_1
   1.1 Branch_1.1
   1.2 Branch_1.2
       1.2.1 Branch_1.2.1
2. Branch_2
   2.1 Branch_2.1
   2.2 Branch_2.2

Tks.

AL