wthin my application that connects to a ArcGIS-FileGDB I encounter problems on empty-gepmetries within my featureclass. Ther are three features within my FeatureClass (polygon): one ordinary polygon, one without any geometry information (geometry = NULL) and one with an empty geometry (at least when I access it via Feature.Shape.IsEmpty). Confusingly the SHP.Area and SHP-Length columns for this last features are zero whereas the data for the actual NULL-geometry is NULL. So what exactly is the difference on those two geometries?
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