(r1) DataLink11RFC < IVOA

IVOA Web>IvoaDAL>DataLink>DataLink-1_0-Next>DataLink11RFC (revision 1) (raw view)~~EditAttach~~
---++ DataLink 1.1 Proposed Recommendation: Request for Comments

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DataLink describes the linking of data discovery metadata to access
to the data itself, further detailed metadata, related resources, and to
services that perform operations on the data.

The main changes in v1.1 are
   * Generalize by adding use cases for links to content other than data files
   * VOSI-availability and VOSI-capabilities endpoints are now optional
   * Service descriptors can include exampleURL and contentType param(s)
   * Added optional link_auth and link_authorized to signal whether authentication is necessary to use the link
   * INFO element with standardID mandatory in {links} response

Latest version of DataLink can be found at:
   * https://www.ivoa.net/documents/DataLink/20230413/index.html

---+++ Reference Interoperable Implementations

---++++ Server side

GAVO implemented the following changes = content_qualifier and local_semantics, service descriptor additional features such as DESCRIPTION? name, content_type, etc....

As a matter of example, a couple of links response for various obscore/sia/ssa tables in GAVO server
   * *rosat.images* : http://dc.zah.uni-heidelberg.de/rosat/q/dl/dlmeta?ID=ivo%3a%2f%2forg.gavo.dc%2f~%3frosat%2fimage_data%2frda_4%2fwg400138p_n1_p1_r2_f2_p1%2frp400138n00_im3.fits.gz where some links have content_qualifier = #image, others have content_qualifier = #event or #timeseries
   * *lamost6.lrs* : http://dc.zah.uni-heidelberg.de/lamost6/q/sdl_lrs/dlmeta?ID=ivo%3a%2f%2forg.gavo.dc%2f~%3flamost6%2flrs%2f373006237 where some links have content_qualifier = #spectrum
   * *califadr3.cubes* : http://dc.zah.uni-heidelberg.de/califa/q3/dl/dlget?ID=ivo%3A//org.gavo.dc/~%3Fcalifa/datadr3/COMB/ARP220.COMB.rscube.fits where some links have content_qualifier = #cube
   * *ppakm31.maps* : http://dc.zah.uni-heidelberg.de/ppakm31/q/cdl/dlmeta?ID=ivo%3a%2f%2forg.gavo.dc%2f~%3fppakm31%2fdata%2fPPAK_M31_F5_cube.fits wher some links have local_semantics filled up and content_qualifier equals #image or #cube

All these are combined with various semantics or content_type values

---++++ Client side

TopCAT prototype (http://andromeda.star.bristol.ac.uk/releases/topcat/pre/topcat-full_datalink11.jar) displays additional features in service descriptor and makes use of additional links table FIELD such as content_qualifier, authorization and local_semantics; The tool behavior is adapted to the content of these new FIELDS. For example Actions suggested by TopCat for the links not only depend on content_type but also from content_qualifier.

AladinDesktop is going to adapt to those new features too.

---+++ Implementations Validators

The following validators are available for DataLink

   * [[http://starlink.rl.ac.uk/star/starjava/docs/ttools/sun256/datalinklint.html][DataLink Lint]] which is part of STILTS
   * [[https://dc.g-vo.org/shomydl/q/f/form][Show my DataLink ]] which is part of DaCHS

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---++ Comments from the IVOA Community during RFC/TCG review period: %RED%RFC_start_date - RFC_end_date%ENDCOLOR%

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)

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---++ Comments from TCG member during the RFC/TCG Review Period: %RED%TCG_start_date - TCG_end_date%ENDCOLOR%

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]]

---+++ [[IvoaEducation][Education Interest Group]]

---+++ [[IvoaKDD][Knowledge Discovery Interest Group]]

---+++ [[IvoaOps][Operations Interest Group]]

---+++ [[IvoaRadio][Radio Astronomy Interest Group]]

---+++ [[IvoaSS][Solar System Interest Group]]

---+++ [[IvoaTheory][Theory Interest Group]]

---+++ [[IvoaVOEvent][Time Domain Interest Group]]

---+++ [[IvoaStdsDocsProc][Standards and Processes Committee]]

---

---++ TCG Vote : %RED%Vote_start_date - Vote_end_date%ENDCOLOR%

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 | | | | |
| Edu | | | | |
| KDIG | | | | |
| Ops | | | | |
| Radio | | | | |
| SSIG | | | | |
| Theory | | | | |
| TD | | | | |
| <nop>StdProc | | | | |

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Topic revision: r1 - 2023-04-14 - JamesDempsey
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