Hi parv. I can't answer your root node question, but I can tell you why you've been downvoted.

Please take a look at:

• Welcome to the Monastery! Make yourself at home.
• Before You Post ...
And most importantly...
• Re: The Case for Learning Perl

I hope you get the most out of what Perl Monks has to offer.

John J Reiser
newrisedesigns.com