<p>My example is of doing "self-discovery" to see if all needful database components seem to be properly
installed.<p>E.g.- the app needs pgcrypto, intarray, and a custom data type. The install script can consequently
informthe production folk either "looks good", or, alternately, "seems problematic!"<p>Actually, I haven't coded a
sampleof the "look for custom SPI & types" part, but it's a natural extension of what I have.<p>Of course, it only
providesa legitimate test when run on the database server, which isn't always how production folk want to do it, but
that'spart of a different argument...
