For Richard's benefit though, I tested the currently documented: ":N:" style parameters and I can't compile a SQL statement with those in, which is a bit worrying (this is with sqlite 3.0.4).
The ":N:" style variables were implemented briefly, but never in a released version. The latest in CVS supports ":AAA" (alphanumeric AAA with no closing colon) because that is what (I am told) is the SQL standard.
-- D. Richard Hipp -- [EMAIL PROTECTED] -- 704.948.4565
