multiple extent

[theresia freska]

hi list,
   
i'm using queryByAttribute in an application to find a street. a street might consists of 3 or 4 lines. if i want to zoom in to that street, how to get an extent for those lines? i've tried using oExtents = oShape->bounds, but it only returns an extent for a line.
   
also, i'm a bit confused about MapServer's keyword, FILTER and CLASSITEM. i guess FILTER is applied in the same time as the spatial data is rendered. does that give a performance improvement compared to CLASSITEM?
   
the more i know MapServer, the more questions come in :D

 
---------------------------------
Don't get soaked.  Take a quick peek at the forecast 
 with theYahoo! Search weather shortcut.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/mapserver-users/attachments/20070329/effc6231/attachment.htm>