I find property maps for ESAs very useful. I can index into a sparse data structure using the ID of a vertex in an ESA. However I couldn't find any way to reconstruct the vertex from the ID. Is this possible? At the moment I have to iterate over the whole ESA again looking to see if I have an entry for the ID for each vertex. It would be much more efficient for me to iterate over my sparse data structure and be able to map IDs back to vertexes/iterators. Thanks, John.