Incrementing/Recursion... (somewhat)

Monday is causing me brain failure...

I'm looking to do the following (or something similar).

based on the pseudo XML below:

<groups>
    <group>First</group>
    <group>Second</group>
    <group>Third</group>
    <group>Fourth</group>
    <group>Fifth</group>
</groups>

in my XSL I want to get output, that "increments" for each item of group
data, as it is processed,
giving HTML output of:

[#] First
[#][#] Second
[#][#][#] Third
[#][#][#][#] Fourth
[#][#][#][#][#] Fifth

where "[#]" is some bit of text,(not a number) that can be repeated for
spacing output in a pseudo tree format.

I guess what I'm looking for is something that will "repeat" or
"for-each", based on the position, within "groups".

T.I.A.

Steve.


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