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As you can see both grouplayer and Map have a list of layers (ILayer) when are mapped in a <list> element. This will result in a 'schema' like this:
Since a layer is in not the collection of map layers and in a grouplayer at the same time the list_index could be shared right??? Unfortunately this is not the case. Consider the following:
1 Add a map
2 Add a grouplayer to the map
3 To that grouplayer add another layer
4 Save / Load
5 Now move the layer of 3 out of the grouplayer into the map of 1.
6 Save / Load
7 ExpcetionAn expcetion will occur: something like 'null index column for collection: SharpMap.Map.Layers'
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