[ImageDM ] dataset datatype diagram comments

[CresitelloDittmar, Mark]

All,
Summary status on this thread..

DataProductType
  + remove 'mixed' from enumeration as this would apply to a composite
DataSet, not a DataProduct
  + change enumeration set to lower-case

RightsType:
  + There is an inconsistency between source documents
       RM: Resource Metadata for the Virtual Observatory (2007)
       VOR: XML encoding schema for Resource Metadata (2008)
       VODS: VOResource Schema Extension for Describing Collections and
Services (2010)
     The VO* are based on RM, and have the same definition for the 'Rights'
element, but a
     different enumeration set.
       RM: "public", "proprietary", "mixed"
       VO*: "public", "proprietary", "secure"

     My inclination is to use the set defined in the VO* docs since that is
what ObsCore currently uses.
     This MAY have an effect on SSA, but I just checked that spec and it
only notes "public" and "proprietary".

datetime
  + Some clarification of what this type covers is in order.. my
understanding is that it is
     - an instant in time. (Date+Timestamp)
     - presumably may be serialized in a variety of formats ( ISO-8601,
FITS, Y-M-D, etc )
     - but probably not MJD, JD ?
     * The documentation for this type should specify these things.
     * I agree that the descriptive text of the DALI RFC thread applies
here.

  + STC-2.0 defines specific Time types ( ISO, JD, MJD ), which
additionally allow specification of the timescale.
     These provide greater control over the details.

Mark
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