UCD List 1.3 Proposed Recommendation: Request for CommentsPublic discussion page for the UCD List specification version 1.3 Proposed Recommendation The UCD Standard has defined a vocabulary for classifying physical quantities and labeling dataset descriptions as well as dataset content and has offered a reference list for the values of these semantic labels at http://www.ivoa.net/documents/cover/UCDlist-20070402.html. It has been revised to include new terms, for statistical quantities, for measurements required by the planetary science and solar physics community, for finer description of metadata. All new terms have been discussed and checked in their context of use and added to this specification. New parts of this proposed recommendation compared to the previous version of the UCD List are marked in yellow in this current PR document for easy reading. The latest version of UCDList is now version 1.3 and can be found on the document repository at http://www.ivoa.net/documents/UCD1+/20170831/index.html The colored version provided here is easier to spot the added terms and changes . All changes are in the colored text ( green text, yellow highlighted terms) . The document has been updated according to the comments addressed during the TCG review . it is now available as http://wiki.ivoa.net/internal/IVOA/UCDList2017RFC/PR-UCDlist-1.3-20170831-Update20180208.pdf Latest decisions and updates after UCD maintenance commiteee feedback : http://wiki.ivoa.net/internal/IVOA/UCDList2017RFC/PR-UCDlist-1.3-20180219.pdf -- MireilleLouys - 2018-02-19Reference Interoperable ImplementationsUCDs are used everywhere in the VO ecosystem, in catalog tables, metadata description, service parameters, etc. In the VOTable specification, FIELD and PARAM elements have a 'ucd' attribute that should take values into the recommended list of terms provided in this specification. TAP Schemata also define UCD to qualify their columns.Implementations ValidatorsThe CDS UCD builder allows to find an appropriate UCD term from a free text description. It has been revised to support the new terms of the vocabulary. Check the new version at : http://cds.u-strasbg.fr/UCD/cgi-bin/descr2ucdTable of Contents Comments from the IVOA Community during
The comments from the TCG members during the RFC/TCG review should be included in the next section.
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< < | We have been careful when defining the meta subtree as we may not have considered all the possible use-cases for an extended usage yet. Allowing Q seems more careful. However, for all dereferenceable string as mentionned above, we agree this is safe to put all as P. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
> > | We have been careful when defining the meta subtree as we may not have considered all the possible use-cases for an extended usage yet. Allowing Q seems more careful. However, for all dereferenceable string as mentionned above, we agree this is safe to put all as P. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-- MireilleLouys - 2018-02-19 and 2018-03-05
(4) As a general rule, I'd say anything that can be in P position cannot have a description unconditionally starting with "Related to" -- at least where UCDs are used on columns, I've always understood them to be the second arguments in is-a relationships, as in "raj2000 is-a main value of a right ascension of an equatorial position" for
<FIELD name="raj2000" ucd="pos.eq.ra;meta.main">-- and you can't say "foo is-a related to...". For S atoms, that's not an issue, of course. Following this, I'm mildly opposed to the "Related to" in front of phys.virial (which is Q). As long as phys.virial remains Q (rather than S), I'd say the "Related to" at least needs to be in parentheses. Changed to S for phys.virial and phys.atmol.collisional to stick to the "Related to" meaning -- MireilleLouys - 2018-02-19 (5) Why is variance in the description of stat.stdev underlined? Incidentally, the fact that there's stat.variance and stat.stdev (shouldn't this be stat.stddev?) also speaks against arith.squared; with it, stat.stdev;arith.squared would be the same as stat.variance, which seems irregular. -- MarkusDemleitner - 2017-09-07 Oh, also, I've just stumbled across this (p. 18): "Deprecated: meta.ref.ivorn IVORN are no longer recommended in the VO context and replaced by IVOID. use meta.ref. ivoid instead" That text is a bit misleading; it's just the term ivorn that's been used inconsistently in the past, the URL community have deprecated URN, and therefore there's no use to keep IVORN in addition to IVOID. So, I'd much rather see the following language: "Deprecated: meta.ref.ivorn The term IVORN should not be used any more for IVOA Identifiers (IVOIDs). In UCDs, meta.ref.ivoid should be used instead" On the other hand, I'd not be totally opposed to keeping the UCD as it is now and explaining '("ivorn" was historically used for "ivoid"; for backwards compatiblitiy, the UCD literal has been retained)' in the UCD explanation. That's mainly because I'd say if we remove terms or rename terms we're really not in the realm of minor version updates any more, and I'd rather not contribute to such slightly fringy activities. -- MarkusDemleitner - 2017-10-27 agreed and updated accordingly. Kept meta.ref.ivorn into the list as deprecated -- MireilleLouys - 2018-02-08 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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> > | While I'm still fairly unhappy about arith.squared, that shouldn't stand in the way when nobody else has worries about it. So, Registry is ok with moving this onward. -- MarkusDemleitner - 2018-04-18 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Semantics Working GroupDocument approved , after the revision and updates following comments given during the TCG review. -- MireilleLouys - 2018-02-19Data Curation & Preservation Interest GroupEducation Interest GroupKnowledge Discovery in Databases Interest GroupTheory Interest GroupSolar System Interest GroupDocument approved. -- BaptisteCecconi - 2018-02-22Time Domain Interest GroupOperationsStandards and Processes CommitteeTCG Vote : Vote_start_date - Vote_end_dateIf you have minor comments (typos) on the last version of the document please indicate it in the Comments column of the table and post them in the TCG comments section above with the date.
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