GIST

> > Oh yes, one last question, is the required method for adding index
> > support via GiST?  I ask because it seems to me that inserts could be
> > exceptionally expensive, though as usual, I still have more to look at.
>
> I think we would recommend GIST because it is easier.

Would someone be able to explain to me exactly what GIST is?  I thought it
was just a _type_ of index, but is it actually a generalised index-creating
framework?  Do other DMBSs use it?  Is it a cool thing I could talk about
when I give my talk at UWA tommorrow?

Chris