<div dir="ltr"><div>All,</div><div><br></div><div>I'd like to add the "DatasetMetadata" model to the list of relevant documents. It is to be the structured model of which ObsCore is a view and also contains these concepts.</div><div>I haven't been in that model in some time, but I recall comparing the various definitions within the DM models when deriving the definitions used there.</div><div> * DatasetMetadata "Facility" definition:</div><div> "The Facility performing the observation. This is modeled as a Role played by a particular Organization"</div><div> * DatasetMetadata "Instrument" definition:</div><div> "The instrument used to create the data. This can be a specific instrument, general type or something else, such as a program in the case of theoretical data."</div><div><br></div><div>The Dataset model uses a Party/Role relation to define the Facility itself. This was a lean toward tie-in with Provenance, and while that may be overkill, it shows that this is definitely thinking of Facility as an Organization and not a piece of hardware.</div><div>For space-based data, I can see 3 layers on this:</div><div> o The organization overseeing/controlling the observation (CXC Operations Center)</div><div> o The hardware/telescope (Chandra X-Ray Observatory)</div><div> o The instrument/detector (ACIS or HRC)</div><div><br></div><div>I don't have strong opinions in this area, and can adopt whatever comes from this discussion.</div><div><br></div>Mark<div><br></div><div><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 27, 2022 at 1:04 PM Tamara Civera <<a href="mailto:tcivera@cefca.es">tcivera@cefca.es</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex">
<div>
<p>Dear DAL, Registry,<br>
<br>
I am writing to you due to the definitions of the terms/fields
"facility" and "instrument" used in the different protocols
Obscore, SIAP v 2.0 and VoDataService. I have found that the
current ones can cause confusion, especially the "facility" term
(I send attached a "facility_name" list from different
Observatories Obscore services and in some, this field contains
the observatory name, in other the telescope name,...). So I
propose to clarify and unify them in these protocols.<br>
<br>
Current "Facility" definition according to the different VO
protocols documentation:</p>
<ul>
<li>Obscore "Facility" definition: <br>
</li>
<ul>
<li>"B7.1 The Facility class codes information about the
observatory or facility used to collect the data."</li>
<li>"C.3
<FIELDname="facility_name"datatype="char"ucd="<a href="http://meta.id" target="_blank">meta.id</a>;<a href="http://instr.tel" target="_blank">instr.tel</a>"utype="obscore:<a href="http://Provenance.ObsConfig.Facility.name" target="_blank">Provenance.ObsConfig.Facility.name</a>"xtype="adql:VARCHAR"arraysize="128*"><DESCRIPTION>telescope
name</DESCRIPTION></FIELD>"</li>
</ul>
<li>SIAP 2.0 "Facility" definition: "2.1.12 The FACILITY parameter
is a string-valued parameter that specifies the name of the
facility (usually telescope) where the data was acquired. The
value is compared with the facility_name from the ObsCore [7]
data model"</li>
<li>VoDataService "Facility" definition: "3.1.1 The observatory or
facility used to collect the data contained or managed by this
resource."<br>
</li>
</ul>
<p><br>
Current "Instrument" definition according to the different VO
protocols documentation:<br>
<br>
</p>
<ul>
<li>Obscore "Instrument" definition: "B7.2 The name of the
instrument used for the acquisition of the observation."</li>
<li>SIAP 2.0 "Instrument" definition: "2.1.13 The INSTRUMENT
parameter is a string-valued parameter that specifies the name
of the instrument with which the data was acquired. The value is
compared with the instrument_name from the ObsCore [7] data
model."</li>
<li>VoDataService "Instrument" definition: "3.1.1 The instrument
used to collect the data contain or managed by a resource."<br>
</li>
</ul>
<p>After discussing this topic with Markus Demleitner in the IVOA
Interoperability Meeting, we have thought these possible
definitions for facility and instrument:<br>
<br>
"Facility" should contain the name of the device that collected
the messenger particles (as opposed to the detector, which is in
"instrument"). In the optical, this would usually designate a
telescope, in the radio, it would be a dish or an array, for space
missions, usually the whole probe.<br>
<br>
"Instrument" should contain the name of the device used for
analysing and detecting the messenger particles. Instances of such
devices would include cameras, spectrographs, or particle
detectors.<br>
</p>
<p>Thanks,<br>
<br>
Tamara Civera</p>
<div>-- <br>
<div id="gmail-m_8105058839243833895signature">
Tamara Civera Lorenzo<br>
<span>Scientific Database and Web Access Engineer</span>
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