<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"><meta http-equiv="content-type" content="text/html; charset=utf-8">Hi Mireille et al.,<div><br></div><div>I'm on vacation until September 15 and mostly don't have internet access. However I don't think that your figures are a good representation of the (what you have segregated into 3 different "types" of) datasets or the relationships between those datasets. These datasets (particularly what you have identified as "explanatory" datasets) can have much broader scope and the relationships can be broader than the figures suggest.</div><div><br></div><div>When I return from vacation I'll provide a more detailed response.</div><div><div><br></div><div>Thanks,</div><div>--Ian<br id="lineBreakAtBeginningOfSignature"><div dir="ltr"><div style="orphans: auto; widows: auto;"><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><div class="" style="line-height: 1.2; margin-top: 0pt; 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margin-top: 0pt; margin-bottom: 0pt;"><div class=""><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><span class="" style="font-weight: 700; font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; background-color: rgba(255, 255, 255, 0);">—</span></div><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><span class="" style="font-weight: 700; font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; vertical-align: baseline; background-color: rgba(255, 255, 255, 0);"><br class="Apple-interchange-newline">Dr. Ian Evans</span></div><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><font class=""><span class="" style="background-color: rgba(255, 255, 255, 0);"><b class="">Astrophysicist</b></span></font></div><div class="" style="line-height: 1.2; margin-top: 0pt; margin-bottom: 0pt;"><font class=""><span class="" style="background-color: rgba(255, 255, 255, 0);"><b class="">Chandra X-ray Center</b></span></font></div><div class="" style="line-height: 1.2; 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margin-top: 0pt; margin-bottom: 0pt;"><span class="" style="background-color: rgba(255, 255, 255, 0);"><span dir="ltr">60 Garden Street</span> | MS 81 | Cambridge, MA 02138</span></div><span style="background-color: rgba(255, 255, 255, 0);"><br class="Apple-interchange-newline"><img webkitattachmentid="d4eb21e7-7042-4cdb-b060-ac0571a540a6" apple-inline="yes" id="EA3A285C-438A-41EF-A730-126A2E9D5284" width="263" height="2" src="blob:null/acaa4078-ab12-4302-8847-89dc9075768b" class="" _mf_state="1" title="null" alt="PastedGraphic-2.png" data-unique-identifier=""><br></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><div dir="ltr"><br><blockquote type="cite">On Sep 3, 2025, at 10:30, Mireille Louys via heig <heig@ivoa.net> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><span>Dear VO Heig , ( cross post to DM as well)</span><br><span></span><br><span>During the VOHE note review , I came up on a question how to identify the various kinds of data sets we are talking about in the note,</span><br><span>and how to consider their relationships .</span><br><span></span><br><span>I think we need uses cases to illustrate how a user will select a data set of interest from the various properties exposed:</span><br><span>- in an observation data set,</span><br><span>- in a response function data set ,</span><br><span>-in other files as draws, pdf, regions proposed with respect to the Chandra archive that I have named 'explanatory datasets'</span><br><span></span><br><span>ObsDataset defined in Obscore is the result of an observation process, using the observing configuration.</span><br><span>Response are computed from various Obsconfig parameters.</span><br><span>Explanatory datasets are also computed from statistical analysis on the observed data.</span><br><span></span><br><span>I suggest these are diffrent in nature and cannot derive from the Obsdataset class of Obscore .</span><br><span>But they are tightly linked to it .</span><br><span></span><br><span>I have tried to illustrate the relations I can guess from our discussions , but this must be iterated with you, High Energy astronomers ,</span><br><span>and with TAP designers to converge to a clear use case .</span><br><span></span><br><span>here attached is a first take .</span><br><span></span><br><span>Thanks for your comments and suggestions .</span><br><span></span><br><span>Best , Mireille</span><br><span></span><br><span>-- </span><br><span>--</span><br><span>Mireille Louys, MCF (Assistant Professor)</span><br><span>Centre de données Astronomiques (CDS) Equipe Images, ICube</span><br><span>Observatoire de Strasbourg Telecom Physique Strasbourg</span><br><span>11, rue de l' Université 300, Bd Sebastien Brandt CS 10413</span><br><span>F-67000 Strasbourg F-67412 Illkirch Cedex</span><br><div><Datasets_roles_inVOHE.pdf></div><span>-- </span><br><span>heig mailing list</span><br><span>heig@ivoa.net</span><br><span>http://mail.ivoa.net/mailman/listinfo/heig</span><br></div></blockquote></div></div></div></body></html>