permissions

Threads are like a file system and we use a path notation to target parts of it.

A message is a container (like a directory) for data (like files) and other messages.

Permissions

Messages have the following permissions: list, add data, add messages.

Data has : read, write/delete.

Predicates on users

Each permission is granted to users who satisfy a boolean combination of these predicates :

• authenticated (not anonymous)
• white list, with two boolean parameters : requests, whites can authorize others
• external white list (e.g. XMPP roster or roster groups)
• connected (e.g. chat rooms)