[Boost-users] [BGL] Edge descriptors for parallel edges

Say, i have the following structure for edge bundle properties struct EdgeProperty { int edge_type; } and i can add parallel edges, that is between vertices u and v cab be several edges with bundle property EdgeProperty with different edge_types. the first question how can i use edge(u,v,graph) function if it returns std::pair <edge_descriptor,bool>, only one descriptor? but i have several descriptors between two vertices. second, how to change the edge_type provided that i got edge_descriptor from edge(u,v,graph) Thanks.