Revised ImageDM-ObsCore architecture

[CresitelloDittmar, Mark]

Doug,

Good to see the revision.. thanks.. I haven't had a chance to read the doc
yet, but
spent today working the model (UML) between Observation/Image/Spectral..
going
from the previous diagram I sent out.

One thing that I'm trying to do with the diagram, is show very
specifically, how the
ObsCore model and Image/Spectral are connected.  The document should start
with the reference to ObsCore.  The ObservationDM in your diagram modifies
ObsCore V1.0 with the changes desired for ImageDM.  This would require an
update
to ObsCore, which I don't think is in the works.

I'm including a revision of my earlier diagram.
ObsCore Package:
  On the right, is the ObsCore model as in that document.. except that I've
extended it from
  an abstract ObservationDataset class.   (I have trouble here, because the
Image/Spectral
  classes need DataID,Target,Curation objects which are Bigger than what is
in ObsCore.)
  I'm pretty sure this matches very closely to the ObsCore document.

ObservationDM Package:
  Is what is needed by Image/Spectral.  That is in pretty close agreement
with Spectral..
  there are name differences for things like dataProductType.
  Note:
   - got rid of "Dataset" class.. the ObservationDataset IS a dataset.
   - this does NOT include the Provenance objects.. they are not in
Spectral.
     They could be.. (since 0 is allowed).

ImageDM package
  - adds a Provenance container (from Doug's diagram).  Note that ObsCore
does not have
    a Provenance class, but associates ObsConfig and Proposal directly.
  - adds CoodSys object.

Mark
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