<div dir="ltr"><div>Bonjour Mireille,</div><div><br></div><div>I've looked at the attached diagram. The main issue I see here is that a typical X-ray dataset (from Chandra and XMM-Newton) being an "event-list" can in fact be considered as image, datacube, spectrum, and time-series all at the same time. And there was a disperser (e.g. grating) involved, it will make it even more complex. Therefore, I don't really understand how you can build any kind of hierarchical relationship between a high-energy dataset and existing types of a dataset in the model. Any ideas?</div><div><br></div><div>With best regards,</div><div>Igor</div><div><br></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Sep 3, 2025 at 12:31 PM Mireille Louys via dm <<a href="mailto:dm@ivoa.net">dm@ivoa.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear VO Heig , ( cross post to DM as well)<br>
<br>
During the VOHE note review , I came up on a question how to identify <br>
the various kinds of data sets we are talking about in the note,<br>
and how to consider their relationships .<br>
<br>
I think we need uses cases to illustrate how a user will select a data <br>
set of interest from the various properties exposed:<br>
- in an observation data set,<br>
- in a response function data set ,<br>
-in other files as draws, pdf, regions proposed with respect to the <br>
Chandra archive that I have named 'explanatory datasets'<br>
<br>
ObsDataset defined in Obscore is the result of an observation process, <br>
using the observing configuration.<br>
Response are computed from various Obsconfig parameters.<br>
Explanatory datasets are also computed from statistical analysis on the <br>
observed data.<br>
<br>
I suggest these are diffrent in nature and cannot derive from the <br>
Obsdataset class of Obscore .<br>
But they are tightly linked to it .<br>
<br>
I have tried to illustrate the relations I can guess from our <br>
discussions , but this must be iterated with you, High Energy astronomers ,<br>
and with TAP designers to converge to a clear use case .<br>
<br>
here attached is a first take .<br>
<br>
Thanks for your comments and suggestions .<br>
<br>
Best , Mireille<br>
<br>
-- <br>
--<br>
Mireille Louys, MCF (Assistant Professor)<br>
Centre de données Astronomiques (CDS) Equipe Images, ICube<br>
Observatoire de Strasbourg Telecom Physique Strasbourg<br>
11, rue de l' Université 300, Bd Sebastien Brandt CS 10413<br>
F-67000 Strasbourg F-67412 Illkirch Cedex<br>
</blockquote></div>