Bidirectional messages such as http are difficult to model for AGREE

[bcbrusse]

Traditionally, our group has been modeling this as a unidirectional connection between two ports and then binding that connection to a virtual bus representing the http protocol. However, in reality this connection is bidirectional as there is a response as well, so in order to logically convey this transfer of data an additional set of ports and connection must be made. I'm curious if any additional features can be made to the AGREE annex to try to help support something like an http message.