Multi-element procedures

[dr-shorthair]

The key 'Planning' use-case, from the OGC Water Quality IE, refers to a complex sampling/observation sequence in which the Procedures (SamplingProcedure, ObservingProcedure) are specified, while the physical Systems that implement these (Samplers, Sensors) are unknown at the time of planning. So the proposed approach utilising the Deployment and hasSubSystem structure is not suitable.

Do we need to
(a) duplicate the hasSubSystem pattern for Procedure
(b) have some way to associate Procedures with Features-of-Interest (proximate and ultimate), maybe via Platforms, or Deployments?

See #318

[KathiSchleidt]

From OMS:
/req/obs-basic/ObservingCapability/ObservingCapability-sem: An ObservingCapability shall be defined as information on Observation(s) that could potentially be provided.

The reasoning for the creation of this class under OMS was to be able to provide the following information for a potential observation at an OMS:Host (SOSA:Platform):

• ObservedProperty
• ObservingProcedure
• Observer
• FoIs

Under OMS we've seen that this is a valuable addition. However, if SOSA wishes to go a different way, transmogrification of Deployment and virtual Sensor, guess there's nothing to be done

[KathiSchleidt]

Alternative proposal - how about using an ObservationCollection without members for this purpose. It covers the requirements, and the slightly differing semantics are not worse than the Deployment and virtual Sensor construct described above.

Maybe this is a simple way out

[dr-shorthair]

Yes, this could work. There is no cardinality constraint on Collection membership, so an empty collection is OK, and is probably a good way to imply planning.

Suggest adding side-by-side examples of

(a) Deployment of Actuators, Sensors, and Samplers (use startTime and endTime to give scope)

(b) Collections of Observations and Samplings (use startTime and endTime, or phenomenonTime with an Interval, to give scope)

to the 'Planning' pattern section https://github.com/w3c/sdw-sosa-ssn/blob/gh-pages/ssn/chapters/ModelPlan.html

[dr-shorthair]

Moved discussion over to #318