ImageDM/ObsCore - Dataset

[CresitelloDittmar, Mark]

My intent in bringing this up was to point out the inconsistency and
motivation for the Dataset object.
Since it is generally agreed that the priority is on generating good
models/class definitions, the following would seem to be the proper
modeling of this section:

  If we accept that "Observation" *is* a dataset.. then
  1) the generalization to "ObservationDataset" is valid

  2) That object should contain the metadata associated to the dataset
      (dataProductType, dataProductSubType, CalibLevel, etc )

  3) There is no need for a "Dataset" class/object, because it already IS a
dataset.

  4) The extension to Observation adds the Derived and DataModel objects,
and the *SI unit attributes?
  4a) Some or these could be absorbed by the Observation model, though I
think only DataModel is generic.

Sound right?

Mark
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