Discovercoll11RFC < IVOA

---++ Discovering Data Collections Within Services: Endorsed Note - Request for TCG Comments and Approvals

Document Link: http://ivoa.net/documents/Notes/discovercollections/20161111/

Source Repository: https://volute.g-vo.org/svn/trunk/projects/registry/discovercollections

RFC period: 2017-03-01 through 2017-04-12

---++ Implementations

Several publishing registries (at least GAVO's, HEASARC's, and CADC's) already produce records as defined in this specification. Also, the future Registry Interfaces 1.1 (also in RFC) intends to employ the method proposed here.

On the client side, WIRR implements discovery of data collections in this way -- [[http://dc.zah.uni-heidelberg.de/wirr/q/ui/fixed?field0=capid&operator0=%3D&operand0=ivo%3A%2F%2Fivoa.net%2Fstd%2Ftap%25&field1=textfields&operator1=%3D&operand1=ucac4&MAXREC=20&OFFSET=0][sample query]].

Also, TOPCAT has experimented with this scheme since several releases. At ftp://andromeda.star.bris.ac.uk/pub/star/topcat/pre/topcat-full.jar, you'll find it in the TAP window (TAP -&gt; Service Discovery -&gt; Reg Prototype). If your TAP service isn't shown with the right number of tables there, please consider fixing your service's registry interface.

---++ Comments from the interested public

---++ Comments from TCG members

WG chairs or vice chairs must read the Note, provide comments if any and formally indicate if they approve or do not approve of the Note. IG chairs or vice chairs are also encouraged to do the same, although their inputs are not compulsory.

---+++ TCG Chair & Vice Chair ( _Matthew Graham, Pat Dowler_ )

---+++ Applications Working Group ( _Pierre Fernique, Tom Donaldson_ )

---+++ Data Access Layer Working Group ( _François Bonnarel, Marco Molinaro_ )

---+++ Data Model Working Group ( _Mark Cresitello-Dittmar, Laurent Michel_ )

a bit out of my area of expertise, but the content seems consistent and logical. This does seem like content where we should be giving a 'preferred' method and guidance to implement.

I had one question in reading the text, which does not effect the assessment, merely a curiosity. Section 2.1.2 specifically states that an ID of form "ivo://ivoa.net/std/sia#query-aux-2.0" generates queries for all minor versions as well (tag-n.%). My question is what happens for ID with a specified minor version "ivo://ivoa.net/std/sia#query-aux-2.2"? If this returns exact match only, how does one get exact match for '2.0'? It seems that the minor version is irrelevant in this thread, given the backward compatibility requirements.

   * No, the query-aux-2.0 is not the query pattern ignoring the minor version, it is the full identifier that lets people match for minor versions if they have to for some reason.  The actual query patterns are discussed in sect. 2.2.  Any hints on how to make that clearer are appreciated -- IVOA.MarkusDemleitner - 2017-09-13

typos in section 2.1.4: 2 instances of 'notherntel' rather than 'northerntel', and 1 instance of 'sourtherntel' rather than 'southerntel'

   * Fixed, thanks -- IVOA.MarkusDemleitner - 2017-09-13

I have no objection to the content and approve the Note. -- IVOA.MarkCresitelloDittmar - 2017-09-11
---+++ Grid & Web Services Working Group ( _Brian Major, Giuliano Taffoni_ )

---+++ Registry Working Group ( _Markus Demleitner, Theresa Dower_ )

---+++ Semantics Working Group ( _Mireille Louys, Alberto Accomazzi_ )

---+++ Education Interest Group ( _Massimo Ramella, Sudhanshu Barway_ )

---+++ Time Domain Interest Group ( _John Swinbank, Mike Fitzpatrick_ )

---+++ Data Curation & Preservation Interest Group ( _Françoise Genova_ )

---+++ Operations Interest Group ( _Tom !McGlynn, Mark Taylor_ )

---+++ Knowledge Discovery in Databases Interest Group ( _Kai Polsterer_ )

---+++ Theory Interest Group ( _Franck Le Petit, Carlos Rodrigo_ )

---+++ Standards and Processes Committee ( _Françoise Genova_)

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This topic: IVOA > WebHome > IvoaResReg > Discovercoll11RFC
Topic revision: r4 - 2017-09-13 - MarkusDemleitner