This needs to talk about AMQP addresses in the doc text: https://qpid.apache.org/releases/qpid-proton-0.37.0/proton/cpp/api/classproton_1_1connection.html#ae8eece4fd4b9e1a2531ca12d2ab57a32
 
Consider also some discussion of AMQP addresses in the intro where we already talk about URLs.