Alignment of ObservationCollection to Datastream

[dr-shorthair]

In #7 et seq. it is suggested that ObservationCollection maps to SensorThings DataStreams. Some text explaining this would help the Note.

[dr-shorthair]

@lieberjosh @KathiSchleidt FYI

[lieberjosh]

Discussing with Steve Liang and will see what I can do.

[KathiSchleidt]

To my understanding, it would mostly map to a MultiDataStream, the caveat being that all observations in the collection must utilize the same Sensor (so Process in O&M Speak).

Picking up on the dataArray result topic from the previous thread (#7), my understanding dataArray result doesn't group different observations, it just provides a more concise encoding of the observations included within the datastream. Example:
http://service.datacove.eu:8080/ST_BRGM/v1.0/Datastreams('http://guid.datacove.eu/BRGM/obs/03745X0021-P1.2')/Observations?$resultFormat=dataArray
vs
http://service.datacove.eu:8080/ST_BRGM/v1.0/Datastreams('http://guid.datacove.eu/BRGM/obs/03745X0021-P1.2')/Observations

This same lightweight structuring can also be applied to multidatastreams, there's a nice example at the end of the STA spec