Metadata from NEW and OLD constructs?

["Lenorovitz, Joel" <Joel.Lenorovitz@xxxxxxxx>]

Title: Metadata from NEW and OLD constructs?

Greetings,

I was wondering if it's possible to get any of the metadata from the NEW and OLD constructs in a trigger or view rule?  Specifically, I'd like to get the column name or identifier anywhere the new record differs from the old record (i.e. NEW.column_X <> OLD.column_X).  Any advice would be greatly appreciated.

Thanks,
JL