ogr tileindex with postgis?

[Neil Best]

Is it possible to use a PostGIS table as a tileindex?  The docs seem to 
indicate so, but I could not find an example of how to connect to 
PostGIS through CONNECTIONTYPE OGR.  I have made some reasonable 
attempts including TILEINDEX "PG:'host=myhost dbname=mydb',mytable" 
(analogous to the examples givens) and using CONNECTIONTYPE postgis in 
the usual fashion and substituting TILEINDEX for DATA, but it always 
seems to be looking for a shapefile.  Normally I would provide better 
snippets but I wanted to throw the question out there before going home 
tonight, so if anyone has any insight or relevant web links I would 
appreciate that information very much.  Thanks.

Neil