Hello, I'm trying to use Boost::polygon to do Boolean operations in my project. My project uses contours that I'm grabbing with OpenCV, processing with Boost::polygon, then writing out to an ESRI shapefile. OpenCV can give me a list of contours within contours within contours...etc, and shapefiles can be written out this way (see link for picture http://icode-mda.googlecode.com/svn/trunk/examples/09_KMLshp/shapefilesWithH oles/results/blobsWithHoles.png ) I haven't been able to jam all of the data in a single polygon_with_holes_data polygon. Is it true that boost::polygon::polygon_with_holes_data can only have an exterior contour and multiple holes, but no contours inside of the hole? In other words, could a single boost polygon support a continent with a lake, with an island, with a pond, with a small island... ? Is there another type that would support this? Maybe the Geometry library? My current work around is to have (1)the continent with a lake as one polygon, (2)the island with a pond as another,(3)the small island as another... Thanks, Bryan