Astronomical Data Query LanguageThe 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 recommendationThe 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 | |||||||||||||||
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< < | Compiled PDF | ||||||||||||||
> > | The DAL group are working on developing the next version (2.1) of the ADQL specification. | ||||||||||||||
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> > | The latest version of the specification is available as a PDF document. | ||||||||||||||
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< < | The ADQL specification is based on the ivoatex environment. | ||||||||||||||
The source code for the document can be found online in the volute repository. | |||||||||||||||
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< < | Use the following command to checkout a local copy of the document source. | ||||||||||||||
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> > | The following command can be used to checkout a local copy of the document source. | ||||||||||||||
svn checkout https://volute.g-vo.org/viewvc/volute/trunk/projects/dal/ADQL | |||||||||||||||
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< < | BNF grammar validation effort | ||||||||||||||
> > | BNF grammar validation effort | ||||||||||||||
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< < | An effort is going on to provide a machine readable and validated [E]BNF grammar for ADQL. | ||||||||||||||
> > | At the October 2016 interop in Trieste the DAL group decided to delay putting the ADQL 2.1 working draft forward for the next stage of review because there were questions about the validity of the Backus–Naur form (BNF) definition of the language grammar included in the specification. | ||||||||||||||
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< < | Decision has been taken not to issue ADQL-2.1 (as a REC) before this task is completed. | ||||||||||||||
> > | Prior to this, the BNF definition of the language grammar has been treated as a human readable resource that was interpreted manually by people developing ADQL parser implementations. | ||||||||||||||
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> > | The October 2016 decision added a new requirement that the BNF definition of the language grammar needed to be machine readable and had to be validated against a set of standard queries. | ||||||||||||||
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< < | To follow and contribute to this work please refer to the GitHub Lyonetia project. | ||||||||||||||
> > | In order to accomplish this, the Lyonetia GitHub project has been set up to develop the tools and test data needed to create a machine readable version of the grammar. | ||||||||||||||
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> > | To follow and contribute to this work please refer to the project plan. | ||||||||||||||
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