<html aria-label="message body"><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Dear HEIG,<div><br></div><div>As a follow-up, the latest draft HEIG proposals for updates to the UCD vocabulary are listed in section 5.3 of the draft HEIG ObsCore Extension document (dated 2025-11-12), which can be found on GitHub at <a href="https://github.com/ivoa/HighEnergyObsCoreExt">https://github.com/ivoa/HighEnergyObsCoreExt</a><div><br></div><div>Some of the preliminary proposals (e.g., phys.flux etc) were updated in this version of the document.</div><div><br></div><div>Thanks,</div><div>—Ian<br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On Apr 16, 2026, at 13:05, Mireille Louys via heig <heig@ivoa.net> wrote:</div><br class="Apple-interchange-newline"><div>
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<div text="#000000" bgcolor="#FFFFFF"><p><br>
</p><p>Hello Heig members, </p><p>In order to prepare the discussion about UCDs tomorrow, <br>
here is a short summary of were we stand in the UCD proposal and
the discussions with the Semantics WG: <br>
</p><p><i>Reminder : </i></p><p>We must keep in mind that the UCD vocabulary helps to <i>categorize</i>
the quantities or labels or information present in a table
column. <br>
It is not a data model class attribute , which is designed
specificaly for the domain it is used for . <br>
<br>
UCDs are used in tables stored as VOTable, either in data tables ,
like in the Vizier catalog tables for instance , <br>
or in metadata tables like in TAP query responses ( as in ObsTAP)
or Cone search response, for instance. </p><p>For the various UCDs discussed in this group , they deal with : <br>
</p>
<ul>
<li><b>event</b></li>
</ul>
For an event_list data set, expressed as a table , column names
describe the kind of quantities recorded for an event and can be
tagged by a UCD .
<p>The event_list table has one event per row , with all quantities
values in the various columns. <br>
<br>
In order to designate an high energy event, we have proposed <i>obs.event</i> together
with Bruno and the semantics chairs in december 2025.<br>
See here the corresponding issue : <a moz-do-not-send="true" href="https://www.google.com/url?q=https://github.com/ivoa/HighEnergyObsCoreExt/issues/48&source=gmail-imap&ust=1776963930000000&usg=AOvVaw1kLB91UZl8MDWiAcyIu2ex">https://github.com/ivoa/HighEnergyObsCoreExt/issues/48<br>
<span style="caret-color: rgb(31, 35, 40); color: rgb(31, 35, 40); font-family: "Mona Sans VF", -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji"; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255); text-decoration: none; display: inline !important; float: none;">S
obs.event Related to a signal messenger detection
(photon or particle)</span></a></p><p>It does not define what an event is ( this is up to the data
model) but it says how to relate a quantity to an event .</p><p>then columns related to an event can be tagged with </p><p>column name | ucd <br>
event_id meta.id;obs.event<br>
event_type meta.code.class;obs.event<br>
event_grade meta.code.class;obs.event</p>
<ul>
<li><b>pha</b></li>
</ul>
Thanks to Ian for the example about PHA quantities related to an
event:
<p>see <a moz-do-not-send="true" href="https://www.google.com/url?q=https://github.com/ivoa/HighEnergyObsCoreExt/issues/39&source=gmail-imap&ust=1776963930000000&usg=AOvVaw3_9C-FlhVraF-GhS0YkJf6" class="moz-txt-link-freetext">https://github.com/ivoa/HighEnergyObsCoreExt/issues/39</a> <br>
<a moz-do-not-send="true" href="https://www.google.com/url?q=https://github.com/ivoa/HighEnergyObsCoreExt/issues/39%23issuecomment-4208293821&source=gmail-imap&ust=1776963930000000&usg=AOvVaw08E5hDjT0J3NAzaVNTPO6H" class="moz-txt-link-freetext">https://github.com/ivoa/HighEnergyObsCoreExt/issues/39#issuecomment-4208293821</a><br>
</p><p>I have tried to tag the UCDs corresponding to the various
columns <br>
using <i>instr.pulse </i>suggested above in the issue thread. <br>
<br>
Most of the quantities can be UCD anotated as shown in this issue.</p><p>A problem remains for :</p><p><span style="caret-color: rgb(31, 35, 40); color: rgb(31, 35, 40); font-family: "Monaspace Neon", ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace; font-size: 11.9px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: break-spaces; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgba(129, 139, 152, 0.12); text-decoration: none; display: inline !important; float: none;">pi pulse invariant amplitude, calculated from energy (and therefore pha), this value is needed to compute the rmf</span></p><p>Can we clarify this quantity? </p>
<ul>
<li><b>phys.flux/ phys.flux.density</b> work in progress (B.
Khelifi)<br>
to be discussed further </li>
</ul>
<ul>
<li><b>phys.particle</b> a VEP has been proposed at <br>
<a moz-do-not-send="true" href="https://www.google.com/url?q=https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-26-particle_types.txt&source=gmail-imap&ust=1776963930000000&usg=AOvVaw04HouvV29NivgznISOCDXl" class="moz-txt-link-freetext">https://voparis-gitlab.obspm.fr/vespa/ivoa-standards/semantics/vep-ucd/-/blob/master/VEP-UCD-26-particle_types.txt</a></li>
</ul>
Cheers, Mireille<br class="Apple-interchange-newline">
<br><p><br>
</p>
<pre class="moz-signature" cols="72">--
--
Mireille Louys, MCF (Assistant Professor)
Centre de données Astronomiques (CDS) Equipe Images, ICube
Observatoire de Strasbourg Telecom Physique Strasbourg
11, rue de l' Université 300, Bd Sebastien Brandt CS 10413
F-67000 Strasbourg F-67412 Illkirch Cedex</pre>
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