Hi All, I'm implementing a half-edge data structure(*) based on adjacency_list. I'm storing vertex and edge properties as bundled properties (classes VertProps and EdgeProps), and can read/write them conveniently with e.g.: graph[vertexDescriptor].vertProp_a = 2 and x = graph[edgeDescriptor].edgeProp_b etc. I also need to keep track of the faces of the planar graph, and I'm wondering if there's a built-in way of doing this that would allow me to read/write face-properties via the same syntax: graph[faceDescriptor].faceProperty Could I derive my half-edge-class from adjacency_list, store and update a property-map for face-data, and provide a new overload for operator[] that takes a faceDescriptor type? or is there a better way? any examples available? thanks, AW (*) see e.g. http://www.holmes3d.net/graphics/dcel/