Call for contributions to DAL WG session at June 2026 Interop

[Gregory MANTELET]

Paul, Theresa,

Thank you for your ideas and contributions.

Some answers, mostly to Paul's ideas:

- About the separation of ADQL-Lib, UWS-Lib and TAP-Lib being all part 
of VOLLT, I have started this split in the new branch `adql-2.1`. In my 
plan, all libraries would still be in the same repository, but will be 
in separate directories, each one corresponding to a Gradle sub-project. 
This way, too, each library is independent. The advantages are code 
independence (development in each library) and library dependence (the 
dependency between TAP-Lib and the two others is explicitly written in 
the Gradle build file). The drawback is that if you are interested by 
only one library (as you do) you are forced to get everything. If you 
are interested, we can still debate about the best solution during the 
next interop in June in Strasbourg.

- Publication in Maven: I have started this process. I now have the 
organization `fr.unistra.cds`. I have pushed in there one version of 
another library (ucidy 
<https://central.sonatype.com/artifact/fr.unistra.cds/ucidy>). My next 
step is to push old versions of ADQL-, UWS-, TAP-Lib libraries.

- Documentation: we can split it into two parts: the Javadoc and the 
tutorial/developer guide (guidelines, FAQ, examples, ...). My plan is to 
put them both in GitHub instead of 
https://cdsportal.cds.unistra.fr/adqltuto.

It is not really visible for the moment, but I am close to a new version 
of ADQL-Lib and TAP-Lib supporting resp. v2.1 and v1.1. I do really hope 
having something for the Nov. interop this year. After this new version, 
I'd like to open the development to other contributors than only me ; 
then, I will write some contributor guidelines in the GitHub repository.

About the DAL contribution, I don't really know whether it is worth 
having a proper talk for this topic. What do you think having an 
informal discussion between interested people during a splinter?

Cheers,
Grégory


On 4/2/26 19:15, Theresa Dower wrote:
> Paul,
>
> Whether or not it's a session talk, I'd love to help MAST coordinate 
> with you and Grégory on this.
>
> We (MAST, but also myself and Joshua directly) are indeed working from 
> a fork of VOLLT, using only the ADQL library portion. The library runs 
> only ADQL-to-database-specific query translation in a Java 
> microservice in our otherwise Python-based TAP stack. No matter where 
> the canonical upstream code lives, we'll probably have to keep working 
> from a fork in the medium term (until we finish migrating away from 
> MAST-specific spatial infrastructure in classes we include) but having 
> a common base to work from separate from the other included libraries 
> would be an improvement. I do like the idea of a codebase used across 
> so many archives and integrated into reference implementations of IVOA 
> standards having a home there if the primary author and github org 
> maintainers support it.
>
> Cheers,
> --Tessa
>
> ------------------------------------------------------------------------
> *From:* interop on behalf of Paul Harrison via interop
> *Sent:* Thursday, April 2, 2026 3:34 AM
> *To:* MANTELET Grégory (OBAS); Joshua Fraustro
> *Cc:* DAL WG; interop at ivoa.net
> *Subject:* Re: Call for contributions to DAL WG session at June 2026 
> Interop
>
> Hi,
>
> I am not sure if this is absolutely worth a talk, but it concerns you 
> both - my group and I believe MAST have been working off a fork of the 
> VOLLT library with the principal aim of using the most recent ADQLLib 
> - which has been living off on a branch in the main repository - I 
> have created https://github.com/Javastro/ADQLLib 
> <https://github.com/Javastro/ADQLLib> which has merged the branch and 
> done a few minor cleanups, and most importantly deleted the UWS and 
> TAP code to allow ADQLLib to evolve at its own pace - I would like to 
> propose moving this to the https://github.com/ivoa 
> <https://github.com/ivoa> organisation to allow greater collaboration 
> and participation. There are some open questions such as
>
> * publishing to a maven repository
> * moving any existing documentation to be within the same repository.
>
> Regards,
> Paul.
>
>     On 1 Apr 2026, at 13:57, Gregory MANTELET via interop
>     <interop at ivoa.net> wrote:
>
>     Dear DAL and IVOA members,
>
>     The June IVOA Interoperability Meeting [indico.ict.inaf.it]
>     <https://urldefense.com/v3/__https://indico.ict.inaf.it/event/3454/overview__;!!PDiH4ENfjr2_Jw!CuyXtJeX_qFTXMbstyNvxhqj4KVkHm0l7pUIo_PXTeo-rWdlpvVJ2N6J_FZtQBIeSg4qK4Kmk9A2ixG7w2afq3j_$> will
>     take place in Strasbourg (France) from the 8th to the 12th of June
>     2026. Remote attendance is supported.
>
>     As a reminder, if you want to participate to this meeting, do not
>     forget to register on the meeting website [indico.ict.inaf.it]
>     <https://urldefense.com/v3/__https://indico.ict.inaf.it/event/3454/registrations/1551/__;!!PDiH4ENfjr2_Jw!CuyXtJeX_qFTXMbstyNvxhqj4KVkHm0l7pUIo_PXTeo-rWdlpvVJ2N6J_FZtQBIeSg4qK4Kmk9A2ixG7w8dmueAo$> (even
>     you plan to attend remotely).
>
>     With this email, Joshua and I invite you to contribute to DAL
>     sessions with a DAL related topic.
>
>         /DAL stands for Data Access Layer. This Working Group aims to
>         define standards and protocols to access data in an
>         interoperable way. Here are few examples of well-known DAL
>         standards: (Simple) Cone Search, SIA (image access), SSA
>         (spectra access), TAP (Table Access Protocol) and ADQL
>         (SQL-like language to query a database). The full list of DAL
>         standards is available on the //IVOA Documents page
>         [ivoa.net]/
>         <https://urldefense.com/v3/__https://www.ivoa.net/documents/__;!!PDiH4ENfjr2_Jw!CuyXtJeX_qFTXMbstyNvxhqj4KVkHm0l7pUIo_PXTeo-rWdlpvVJ2N6J_FZtQBIeSg4qK4Kmk9A2ixG7wwlkDDit$>/./
>
>     During this interop., you can contribute, remotely or in-person,
>     with a talk presenting implementations, sharing your experience as
>     user, presenting and discussing progress on a DAL standards, or
>     presenting use-cases.
>
>     If you are interested, please send your contribution to
>     gregory.mantelet at astro.unistra.fr
>     <mailto:gregory.mantelet at astro.unistra.fr> and jfraustro at stsci.edu
>     <mailto:jfraustro at stsci.edu> with:
>
>       * a speaker name,
>       * a title,
>       * ideally an abstract.
>
>     If you are unsure about the suitability of a talk, or are a first
>     time contributor, please get in contact with us.
>
>     Cheers,
>     Grégory Mantelet and Joshua Fraustro
>
>
>
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