how to use user map query to generate a calculated value with MapServer?

[Raymond Fu]

hi,
 
Is it possible and how can I use user map query to generate a calculated value and ?  For example, user draws a recentangle area on the map, the total number of added value of certain field for all the feature within the selected area will be displayed on the browser.
 
Thanks
 
Raymond


 Send instant messages to your online friends http://uk.messenger.yahoo.com 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/mapserver-users/attachments/20070214/f2e53868/attachment.htm>