DM#2 session follow up

[Laurent Michel]

Dear DMers,


During last Interop we had a session, requested by Markus, that aimed at opening 
a wide discussion on both Measurements and Coordinate models and possibly at 
refining their usages.

  https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpNov2020DM

This came after a long discussion on the mailing list, related to the necessity of keeping 
or not a tight dependancy between Measurements and Coordinates. 
It has also been suggested that product models (e.g. CubeDM ) could be replaced with 
domain related components.

Many people have participated to the discussion with many positive contributions. 
Although the goal of this message is not to report on that meeting, we do need to note 
a few points:
- There is a clear demand for using models
- There is a clear demand for the models to be simple and modular.
- The distinction between what is modelling and what is serialisation is unclear.

The need for a concrete solution for annotating catalog data, that resurfaced last week, 
has been tackled by the WG for a couple of years along with the development of 
Measurements/Coordinates models.
- 2018: Discussions have been engaged on this topic after a hands-on session in Victoria. 
            https://wiki.ivoa.net/twiki/bin/view/IVOA/SourceCatalogs
- 2019: We asked data providers and client developers to present their needs in a dedicated 
            session at Paris
            https://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpMay2019DM

After these 2 surveys the scope of the model usage has been exposed in Virtual May and 
we have been working on MANGO (model for source data with some MC adaptations ) 
that has been sketched in both Groningen and virtual-May and then presented last week.

    https://wiki.ivoa.net/internal/IVOA/InterOpNov2020DM/Mango_interopFall2020.pdf

To continue this action we propose to organise a virtual workshop (initial proposal by Tom 
to the TCG) with the hope of getting a widely accepted framework.

The idea is not to start afresh but to give to the participants the opportunity of matching 
their needs with the current proposals.
To get a clear picture of what has to be done, we propose to work with a variety concrete 
use cases and data samples provided by interested people. 
We will then take a bit of time to exercice different options on this material before organising 
the meeting where everyone will be able to present their own conclusion.

Details of this action will be released soon, unless someone has a clear veto.

Regards

Laurent - Jesus

PS You will be able to follow the topic on  #data-models at Slack

—
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jesuischarlie/Tunis/Paris/Bruxelles/Berlin

Laurent Michel
SSC XMM-Newton
Tél : +33 (0)3 68 85 24 37
Fax : +33 (0)3 )3 68 85 24 32
Université de Strasbourg <http://www.unistra.fr>
Observatoire Astronomique
11 Rue de l'Université
F - 67200 Strasbourg

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