2. Start of Experiment: tells the IR to send sensed data from some sensors to a DM regularly for a given period of time
3. Start of Experiment: tells the DM to expect data from an IR for a given period of time.
4. IR requests the data from SAL
5. SAL sends data to the IR
6. New SML document: sent at the start of the experiment or when there is a change to the document.
    Sensed data: sent to a DM when an experiment has been started