Astronomical Data Query Language

The Astronomical Data Query Language (ADQL) is the language used by the IVOA to represent astronomy queries posted to VO services. ADQL is based on the Structured Query Language, especially SQL 92; special restrictions and extensions have been defined in order to support generic and astronomy specific operations.

Current recommendation

The current IVOA Recommendation is ADQL-2.0 (30 October 2008).

ADQL-2.0-Next page collects proposed features and notes while developing the next revision of the specification. ADQL-2_0-Errata keeps track of the Errata status for this specific version of the recommendation.

ADQL-2.1 Working draft

Compiled PDF

• DAL Internal WD (2016-05-02): WD-ADQL-2.1-20160502-05 (svn revision 3385)

Document source

The ADQL specification is based on the ivoatex environment.

The source code for the document can be found online in the volute repository.

• ADQL

    svn checkout https://volute.g-vo.org/viewvc/volute/trunk/projects/dal/ADQL

BNF grammar validation effort

An effort is going on to provide a machine readable and validated [E]BNF grammar for ADQL.

Decision has been taken not to issue ADQL-2.1 (as a REC) before this task is completed.

To follow and contribute to this work please refer to the GitHub Lyonetia project.

Previous versions

• DAL Internal WD (2015-06-01): WD-ADQL-2.1-20150601 (svn revision 2983)