[ImageDM ] dataset datatype diagram comments

[Louys Mireille]

Hi again,

here are my following comments :

* Dataproduct type :
I think the list defined in Obscore can be reused here :
LightCurve is missing

* I do not understand "Mixed" .
We discussed this concerning files distributed as tarballs with an 
heterogeneous content.
In this case , the content requires multiples DataID classes , so is 
actually a composed DataSet.

* Does "Photometry" actually stand for "SED"?

* /Quantity /vs RealQuantity
In the Position class, only derived classed can be used as attributes , 
I guess.
so we would probably define all the PositionN to have RealQuantity 
attribute(s).
More generally , do we really need Position , while we have precise STC 
Space Time Coordinates?
Or are we dealing with indices in an ND array??? so why not 
PositionIndex or the like ?

*datetime
after the discussion in DAL during the DALI RFC period about the Time 
format one should use, ISO , etc...
it seems to me that we should rely on precise time formats, ISO, MJD , 
etc ....
I do not understand the purpose of 'datetime' here.

*RightsType
Public/Secure/Proprietary  are the value we adopted for Obscore.

Mireille

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