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VODataServiceV12RFC
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---+ <span style="color: #0000ff;"><span style="text-decoration: underline;">VODataService 1.2</span></span> Proposed Recommendation: Request for Comments %TOC{depth="2"}% <span style="background-color: transparent;">The latest version of <span style="color: #0000ff;"><span style="text-decoration: underline;">VODataService 1.2</span></span></span><span style="background-color: transparent;"> can be found at:</span> * https://www.ivoa.net/documents/VODataService/20210223/index.html While future versions may be migrated elsewhere, VODataService 1.2 is managed by the legacy volute repository at: http://volute.g-vo.org/viewvc/volute/trunk/projects/registry/VODataService/ ---+++ Summary VODataService 1.2 is an incremental update to the widely-used VODataService Registry extension (98% of all registry records use VODataService resource types). We expect 100% backward compatibility. We believe there are three main points for TCG review: * <p>Post-STC1 (and realistically usable) Space-Time coverage in the registry; sect. 3.2</p> * <p>New resource types to support multi-resource services (as per Discovering Data Collections); sect. 3.1</p> * <p>Waveband is now governed by a vocabulary of messenger types; promoting this to REC would also make the vocabulary http://www.ivoa.net/rdf/messenger accepted (with Photon and Neutrino included as new terms).</p> There are also a few minor changes to tableset conventions. This requires review by those familiar with VOSI Tables and TAP. ---++++ Changelog since REC-1.1 <br /> In approximate order of importance: * <p>Deprecated !STCResourceProfile and replaced it with spatial, temporal, and spectral children of coverage; spatial has a frame attribute not further defined so far to allow for future extension to e.g., solar system bodies.</p> * <p>Dropped vs:Waveband and changed waveband to being controlled by a vocabulary that initially grows a generic Photon and a Neutrino concept over what the previous Waveband had.</p> * <p>Introduced new !DataResource and !CatalogResource resource types and wove them into the inheritance hierarchy to !CatalogService; these are to be used for "dependent" resources.</p> * <p>New (optional) table/@nrows attribute gives an estimate for the size of a table</p> * <p>extendedType is now defined to correspond to VOTable xtypes in the absence of extendedSchema.</p> * <p>Required inclusion of quotes for delimited identifiers in a SQL context.</p> * <p>Sanctioning the use of footprint/@ivo-id to indicate the footprint standard used (this goes against the semantics of the !ServiceReference tye underlying footprint, because the reference was originally intended to go to a registered service returning footprints but no such services ever came around, and instead people used ivo-id as specified now).</p> * <p>Now allowing any vs:DataType element to define vs:InputParams.</p> * <p>In order to still ensure schema validation of type names, now advising to have an explicit xsi:type in param's dataTypes.</p> * <p>Deprecated TAPType.</p> * <p>DataType/@arraysize no longer defaults to 1, and the interpretation of arraysize=1 as a scalar is withdrawn. Use empty arraysize for scalars now.</p> * <p>Added a SHOULD requirement on !CatalogResources to have a tableset.</p> * <p>Deprecated !DataCollection and !StandardSTC (which are no longer needed).</p> * <p>Adding a summary of the [[https://www.ivoa.net/documents/discovercollections/20190520/index.html][Discovering Data Collections]] EN.</p> * <p>BaseParam's delim attribute no longer defaults to blank. That conflicted with VOTable, where other conventions are in place (e.g., for string arrays).</p> * <p>Now discouraging the use of delim outside of !InputParams.</p> * <p>No longer requiring unique table names within a tableset; uniqueness is now required within a schema. Many services have been in violation of the old unique-within-tableset rule for a long time without operational difficulties, and this change affects little as fully qualified names are now required for the main uses of tableset.</p> * <p>Ported source to ivoatex.</p> <span style="font-size: x-small;"> </span> ---+++ Reference Interoperable Implementations On the production side, [[http://soft.g-vo.org][DaCHS]] has been producing records with most of these features for quite some time. As an example, see the Heidelberg data center's OAI endpoint at https://dc.g-vo.org/oai.xml <br /> <br /> Also on the production side, VizieR is producing VODataService 1.2-compliant records, including coverage declaration, on http://cdsweb.u-strasbg.fr/registry/beta/ , which is slated to become the primary VizieR publishing registry in Mid-2021.<br /> <br /> On the consumption side, the [[https://dc.g-vo.org/browse/rr/q][Heidelberg RegTAP]] service parses the extra information and exposes it in custom RegTAP extensions rr.stc_spatial, rr.stc_spectral, and rr.stc_temporal. The table's nrows attribute shows up in rr.res_tables. ---+++ Implementation Validators The syntax (and a bit of the semantics, too) of VODataService records can be checked with ordinary XML schema validation tools. As setting up the necessary schema locations is somewhat involved, you might want to use DaCHS's dachs val xsd command. For VOSI tables endpoints of TAP services, the STILTS =taplint= validator release >3.4, or failing that the [[ftp://andromeda.star.bris.ac.uk/pub/star/stilts/pre/stilts.jar][latest pre-release]], will validate against the schema coming with this PR. ---++ Comments from the IVOA Community during RFC/TCG review period: RFC_start_date - RFC_end_date The comments from the TCG members during the RFC/TCG review should be included in the next section. In order to add a comment to the document, please edit this page and add your comment to the list below in the format used for the example (include your Wiki Name so that authors can contact you for further information). When the author(s) of the document have considered the comment, they will provide a response after the comment. Additional discussion about any of the comments or responses can be conducted on the WG mailing list. However, please be sure to enter your initial comments here for full consideration in any future revisions of this document * Sample comment by TWiki.WikiName * Response (by TWiki.WikiName) --- --- ---++ Comments from TCG member during the RFC/TCG Review Period: RFC_start_date - RFC_end_date WG chairs or vice chairs must read the Document, provide comments if any (including on topics not directly linked to the Group matters) or indicate that they have no comment. IG chairs or vice chairs are also encouraged to do the same, althought their inputs are not compulsory. ---+++ TCG Chair & Vice Chair ---+++ [[IvoaApplications][Applications Working Group]] ---+++ [[IvoaDAL][Data Access Layer Working Group]] ---+++ [[IvoaDataModel][Data Model Working Group]] ---+++ [[IvoaGridAndWebServices][Grid & Web Services Working Group]] ---+++ [[IvoaResReg][Registry Working Group]] ---+++ [[IvoaSemantics][Semantics Working Group]] ---+++ [[IvoaDCP][Data Curation & Preservation Interest Group]] ---+++ [[IvoaTheory][Education Interest Group]] ---+++ [[IvoaKDD][Knowledge Discovery Interest Group]] ---+++ [[IvoaSS][Solar System Interest Group]] ---+++ [[IvoaTheory][Theory Interest Group]] ---+++ [[IvoaVOEvent][Time Domain Interest Group]] ---+++ [[IvoaOps][Operations]] ---+++ [[IvoaStdsDocsProc][Standards and Processes Committee]] ---++ TCG Vote : Vote_start_date - Vote_end_date If 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. | Group | Yes | No | Abstain | Comments | | TCG | | | | | | Apps | | | | | | DAL | | | | | | DM | | | | | | GWS | | | | | | Registry | | | | | | Semantics | | | | | | DCP | | | | | | KDIG | | | | | | SSIG | | | | | | Theory | | | | | | TD | | | | | | Ops | | | | | | !StdProc | | | | |
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Topic revision: r3 - 2021-03-09
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MarkTaylor
IVOA
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