[Gdal-dev] Dissolving internal boundaries

[matt.pettis at thomson.com]

Is there any way with gdal/ogr tools to join polygons into a single
polygon based upon a .dbf attribute and dissolve the interior boundaries
of constituent shapefile polygons?  I created an ascii visual at the
bottom to describe what I want if the verbage is not clear.
 
thanks,
matt
 
Before:
 
----------------------
|  Polygon 1         |
-----------------------------
| Polygon 2  | Polygon 3    |
-----------------------------
 
After:
 
----------------------
|                    |
|   Joined Region    |_______
|                           |
-----------------------------
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