[Boost-users] [BGL] VertexProperties as a Nested Type

Dear all, What is my chance to get VertexProperties back in adjacency_list<OutEdgeList, VertexList, Directed, VertexProperties, EdgeProperties, GraphProperties, EdgeList> as a nested type? So, for example: typedef adjacency_list<vecS, vecS, directedS, string> graph_type; where VertexProperties == string. What nested type can I use to get to string from graph_type? It would have made a lot of sense for example if the following piece of code worked: typedef graph_traits<graph_type>::vertex_type my_type; and, as a result, my_type == string. Is a similar thing possible? TIA, --Hossein