On Fri, Apr 03, 2009 at 08:13:10AM +0000, Tobias wrote:
> 
> The interval syntax has the drawback to require an upper value,
> which is not true for specs like ">5".

Why? My original proposal says you can leave out upper or lower value,
e.g. (123,) and of course the syntax should be backward compatible to
allow simple numbers, e.g.
123 or 124 or (127,130)

> 
> I have implemented a module (attached) which supports:
> 
> - Daniel's simple conditions (">a", "<a")
> - closed intervals ("[a,b]")
> - ISO open intervals ("]a,b[")
> - set builder open intervals ("(a,b)")
> - boolean operators ("and" and "or", also accepted as "&&" and "||")

Nice. I currently don't have the time to look into this.

Ralf
-- 
Ralf Schlatterbeck
email: ralf@zoo.priv.at FAX: +43/2243/26465/23