Sorry, I switched in a hurry :)
... however, you got it. It could even be a database that contains products and their parts and services that goes for unknown depth level. But, no matter how deep it goes and what is to be displayed, the script have to display parent entity and all of the tuples of its child entity and then all tuples of child entity (which is parent in this turn) and all of tuples of its child enitities, etc.
It has already been done, using PHP and MySQL, but I'm doing things in Perl.
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