Current Standards

Standard Current Released Errata Next
ADQL - Astronomical Data Query Language v2.0 REC 2008-10-30 None  
DALI - Data Access Layer Interface v1.1 REC 2017-05-17 None 1.1 Next
Datalink v1.0 REC 2015-06-17 Errata 1.0 Next
SimDAL - Simulation Data Access Layer ** v1.0 REC 2017-03-20 None  
Simple Cone Search v1.03 REC 2008-02-22 Errata  
SIA - Simple image Access v2.0 REC 2015-12-23 None  
SLAP - Simple Line Access v1.0 REC 2010-12-09 None  
SODA - Server-side Operations for Data Access v1.0 REC 2017-05-17 None  
SSA - Simple Spectral Access v1.1 REC 2012-02-10 None  
TAP - Table Access Protocol v1.0 REC 2010-03-27 Errata 1.1 RFC 1.0 Next
TAPRegExt - A VOResource Schema Extension for Describing TAP Services * v1.0 REC 2012-08-27 None  
VOEvent Transport Protocol ** v2.0 REC 2017-03-20 None  

* Registry standard developed by the DAL working group.

** Interest group developed standard endorsed and administered by the DAL working group.

Ongoing Work

Standard Version Date Status
ObsLocTAP - Observation Locator Table Access Protocol v0.2 2018-07-23 Working Draft
ObjVisSAP - Object Visibility Simple Access Protocol v0.2 2018-07-23 Working Draft


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 Activities

DAL future

Idle or Abandoned

Past Activities

WG Roadmap

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 accordig to the 3 factor semantics.

Recommended reading

How to contribute

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Topic revision: r6 - 2019-01-22 - JamesDempsey
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