I think there is an update schema method; please try it out and write a 
wiki page so the rest of us can understand how to use it ;-)
Worst case you can copy the contents from one shapefile to a new 
shapefile with an extra column.
Jody
> hello, everyone
>
> i have some shapefiles with its siblings .shx, .dbf and .prj, can i 
> use geotool to add a field to these files?
> for example, the shapefile's dbf have three attributes like 
> Population, name and type, I want to add a customed attribute "weight" 
> to it.
>
> I have check out SHPLIB which is c library, but it can't change the 
> fields after you create the shapefile. it only can add fields when you 
> create a new shapefile, but cannot modify an existed one.
>
> anyone knows ? thanks!
>
> -- 
> Wir müssen wissen,Wir werden wissen
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