tileindex format options

[Kralidis,Tom [Burlington]]

Hi,

We have a situation where we have a tileindex of satellite imagery and
would like to have, as part of the tileindex, columns with metadata for
each scene id.  We then use the tileindex as a LAYER to depict scene
outlines.  A user could, via WMS query a scene to acquire metadata about
that scene, from the tileindex.

Having said this, do tileindexes specifically have to be shapefiles?
For instance, can they be a PostGIS table?

Cheers

..Tom