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<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="meta.id;instr.tel"utype="obscore:Provenance.ObsConfig.Facility.name"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>
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Tamara Civera Lorenzo<br>
<span class="cargo">Scientific Database and Web Access Engineer</span>
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