Revised ImageDM-ObsCore architecture

[Laurino, Omar]

Sorry, I didn't mean to write *funky* statement, but I mistakenly edited a
previous line and *funky* wasn't deleted.

Omar.


On Wed, Nov 13, 2013 at 8:37 PM, Laurino, Omar <
olaurino at head.cfa.harvard.edu> wrote:

> Doug,
>
> On Wed, Nov 13, 2013 at 8:10 PM, Douglas Tody <dtody at nrao.edu> wrote:
>
>> So for example the Observation may be described, and a
>> "package" can be downloaded containing multiple data products.  Or the
>> individual datasets (data products) may be exposed, linked by a common
>> obs_id.  Or some combination of the two.
>>
>
> This is interesting, even though I believe it needs some clarification
> regarding the "combination of two", which makes the description somewhat
> fuzzy.
>
> I believe neither Mark's nor your diagrams capture this, which calls, at
> the very least, for Observation having a collection of 0..* Datasets, as
> opposed to either being a generalization of Dataset or containing a single
> Dataset.
>
> Regarding your comment on the specialization of Observation vs ObsCore:
> specialization works exactly this way: a 'car' is a specialization of a
> 'vehicle', i.e. it has all the features of a vehicle, plus more stuff, so
> it is larger.
> See for example this:
>
> http://understandingrdbms.blogspot.com/2013/04/data-model-part-2-specialization.html
>
> However, I agree that this distinction between Observation and ObsCore is
> kind of funky and probably unnecessary, and I know that others share this
> opinion as well.
>
> However, this is what ObsCore calls for: it is clearly stated in the
> document that ObsCore is... ahem... a core model, part of an unspecified
> larger Observation Model.
>
> Since we can probably represent this funky statement in a technically
> formal and consistent way, we can try to do it, so that we don't need to
> change the current definition of ObsCore.
>
> Omar.
>
>
>
>
> --
> Omar Laurino
> Smithsonian Astrophysical Observatory
> Harvard-Smithsonian Center for Astrophysics
> 100 Acorn Park Dr. R-377 MS-81
> 02140 Cambridge, MA
> (617) 495-7227
>



-- 
Omar Laurino
Smithsonian Astrophysical Observatory
Harvard-Smithsonian Center for Astrophysics
100 Acorn Park Dr. R-377 MS-81
02140 Cambridge, MA
(617) 495-7227
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