The CID protocol take the part of a strong process/transport distinction in the design of its extension possibilities. The process part is designed to be generic and reused in any context. The transport part could be extended by the addition of new kind of transport.
An valid CID extension must contains at least the schema of the extended manifest and the implementation requirement of the new transport.
The manifest schema of CID, included in these specifications, defines where CID extensions should be written in the manifest : in the