Hi,

I have a question which is not Perl exclusive but I think people using programing languages for text processing might have encountered it, and since a large fraction of Perl comunity uses Perl do exactly that I thought someone might know the answer.
So, I have a text file containg integers (The file does not necessary need to sontain integers). Integers are placed into two columns such that integer from the first column is a parent integer to the integer in the second column. Example:

1  2
1  5
1  7
2  6
2  8
3  1
3  2
...
[download]

So basically a tree structure encoded as a two column table. My question is: Is there a proper term for files in which the information is ordered in such a manner? Is there a proper termn for such order?

Thank you

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