|Sloan Digital Sky Survey|
|Astronomical Data Query Language|
Draft Specifcation for IVOA SkyNode Interface
As of 0.6 ADQL has been split to its own document
As of 0.7 Standard Interfaces has been split to its own document on ivoa.
|Version 0.7.4||SkyNode Word file||SkyNode pdf file||ADQL Word||ADQL pdf|
|Version 0.7.1||ADQL Word||ADQL pdf|
|Version 0.7||SkyNode Word file||SkyNode pdf file||ADQL Word||ADQL pdf|
|Version 0.6||Skynode Word file||Skynode pdf file||ADQL Word||ADQL pdf|
|Version 0.5||Word file||pdf file|
|Version 0.4||Word file||pdf file|
|Version 0.3||Word file||pdf file|
Open skyquery and skynodes are to be discussed on the VOQL mailing list..
To join send a mailwith body containing "subscribe voql" to email@example.com or click on this link.
To post send mail to firstname.lastname@example.org
The following diagram was initially presented at the Cambridge IVOA meeting as an explanation of VOQL/ADQL. This version has been modifed and appears in the current specification
ADQL is a simple underlying protocal which would allow Archives to join the Virtual Observatory. VOQL is a higher level languge requiring ADQL and other Services to function.
This XSD is not quite up to date with the latest SpecADQL is the XML equivalent of a scaled down SQL grammar. The only operation permitted is a Select. Regions in the form of the region specification will be allowed in ADQL to facilitate Astronomy Queries. This helps in providing the area in which the objects have to be found. The schema can be dowloaded here ADQL Schema.
ADQL is in XML because it is easier to handle on servers - you do not need to do the hard work of parseing SQL, a parse tree is handed to you.
However a parser for converting from SQL strings to ADQL and vice versa will be very usefull. Although some Graphical interface will be built it will also be usefull to type SQL directly.
Hence there will be a Semanticaly identical string representaion for most ADQL documents which we may call SkyQL - it is unclear how we represent regions in this scheme.
A possibility/starting point is the coverspec of HTMDLL spec.
This web service provides translation between ADQL and SQL
The following pages are built upon this service:
Below given are links to tutorials and samples on ADQL Services (these are alittle out of date but still usefull).
ServiceType like '%skynode%'to find all open skynodes.
Last Modified :Friday, May 21, 2004 at 10:42:00 AM , $Revision 1.21 $