The common usage in Saros is to use this observable as a global variable to perform global state programming which was not intended. Use ISarosSession#getID() instead which will be almost equivalent in most cases.
Do not use this resource identifier to build a fully qualified Jabber identifier, e.g the logic connects to a XMPP server as foo/Saros but the assigned Jabber identifier may be something like foo/Saros765E18ED !
This method should be used with great care. It is up to to the caller to ensure that the returned reference can be garbage collected when the session has stopped