RANGE type, and its subtype parameter

Hi,

I'm working on adding support of range types in pgAdmin and I have a
really hard time understanding the subtype parameter of a range type.
How can I find all the types associated with a specific operator class?
I'm pretty sure it's a really dumb question, but I'm completely lost
here.

Thanks.

Regards.


-- 
Guillaume
http://blog.guillaume.lelarge.info
http://www.dalibo.com