Good day, I have a graph with bundled properties attached to both the vertices and edges. typedef long int ASElementID; enum ASRelationships { NoRelationship, IsContaining, IsBeside, IsAbove, IsCommentedBy, IsMadeOf }; typedef boost::adjacency_list Graph; When using the write_graphviz and writing my property writer, I get the error_property_not_found error. Reading post 18294 (http://thread.gmane.org/gmane.comp.lib.boost.user/18294) I see what I should probably do. My problem is that I cannot give the address of ASElementID since it is an int. Is it a limitation? Do I *have* to use a struct for it to work? Something like: struct IDType {int ID}; Thanks and have a nice weekend! Jean-Olivier