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IVOA Data Access Layer
Contents
Rationale
The task of the DAL working group is to define and formulate VO standards for remote data access. Client data analysis software will use these services to access data via the VO framework; data providers will implement these services to publish data to the VO. The DAL working group will define the scope of the DAL standards, outline a process by which DAL standards are defined, and generate the initial version 1.0 of the DAL standard. This standard will provide guidance to data centers and survey projects when designing VO compliant interfaces. It will allow them to justify the allocation of resources for its implementation and maintenance. Once the work on Version 1.0 is accomplished the working group will coordinate future development of the standard.
Current Standards
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< < | * Registry standard developed by the DAL working group. |
> > | * ObsLocTAP, ProvTAP are managed in cooperation with the Data Model WG |
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< < | ** Interest group developed standard endorsed and administered by the DAL working group. |
> > | ** Registry standard developed by the DAL working group. |
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> > | * Interest group developed standard endorsed and administered by the DAL working group. |
| Ongoing Work
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ADQL - Astronomical Data Query Language |
v2.1 |
2018-01-12 |
Proposed Recommendation |
GitHub |
Q2 2021 |
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ADQL - Astronomical Data Query Language |
v2.1 |
2021-05-28 |
Proposed Recommendation |
GitHub |
Q1 2022 |
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ObjVisSAP - Object Visibility Simple Access Protocol |
v1.0 |
2020-05-14 |
Working Draft |
GitHub |
Q2 2021 |
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ObsLocTAP - Observation Locator Table Access Protocol * |
v1.0 |
2020-05-14 |
PR & RFC |
GitHub |
DM WG coordinated |
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WG Sessions, Meetings & Roadmap
Upcoming events and meetings: |
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Interop DAL sessions |
DAL Running Meetings |
DAL Roadmaps |
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Previous sessions and meetings can be found starting from the IVOA Events wiki page.
Previous DAL Roadmaps can be found starting from the IVOA TCG wiki page in the IVOA Technical Assessment and Roadmap Documents section.
Older roadmaps can be found here:
DAL future
Other Current Activities
Idle or Abandoned
Past Activities
Notes on Defining a DAL Standard
This page contains some ideas and definitions to help frame the definition of DAL standards. To be discussed.
Notes on Defining new service parameters
This page contains some hints to help defining new service paremeters according to the 3 factor semantics.
Recommended reading
How to contribute
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