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[Go-database] Question about tree structure occurrences

chris mungall cjm at
Fri Nov 25 09:27:19 PST 2005

Hi Alberto

For 1, yes, it is possible, and such structures do exist in GO. Try 

  term2term AS x,               -- vertical, left
  term2term AS y,               -- vertical, right
  term2term AS a,               -- diagonal, lower left to upper right
  term2term AS b                -- diagonal, lower right to upper left
  x.term1_id = b.term1_id       AND
  y.term1_id = a.term1_id       AND

  x.term2_id = a.term2_id       AND
  y.term2_id = b.term2_id       AND

x.term1_id != y.term1_id       AND          -- change to < to avoid 
reporting symmetries
x.term2_id != y.term2_id;

I'll leave it to you to extrapolate this to 2

On Nov 25, 2005, at 9:10 AM, Albert Vilella wrote:

> Dears,
> I would like to ask a question regarding the structure of Gene 
> Ontology:
> Is it possible, at some point of the tree, to have parent-child
> relationships like the ones depicted in the diagram?
> (childs at the bottom, parents at the top)
> Thanks in advance,
> Bests,
>     Albert.
> _______________________________________________
> Go-database mailing list
> Go-database at

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