IVOA VOQL WG session ESAC Villafranca del Castillo

IVOA – VOQL WG session ESAC Villafranca del Castillo Madrid, Spain Friday, October 7 th, 9: 30 - 13: 00 Yuji Shirasaki Maria Nieto-Santisteban VOQL-Madrid October 7, 2005 1

Discussed Reviewed ADQL and Sky. Node specifications WDs ADQL = CORE + EXTENSIONs Core provides easy integration of DAL & VOQL • Basic Sky. Nodes support CORE ADQL + optional extensions • Full Sky. Nodes support CORE ADQL + XMATCH extensions + optional extensions Different XMATCH functions with different parameter sets VOQL-Madrid October 7, 2005 2

Discussed Mayor points of debate • Extensions: top, offset • Data types follow VOTable – timestamp, time, date, timeinterval – conclusion: only keep VOTable data types for returned data tables • Specifying table names qualified by archive names, what can we use for a short name? – can we use the SHORTNAME that the registry has? Can we demand uniqueness? (no) – conclusion: we use the identifier in the ADQL • Need to define how to express units. What is the syntax? VOQL-Madrid October 7, 2005 3

Presented – Brian Thomas - Achieving a Unified Query Layer in the VO Good discussion about how to integrate Data Models UCDs & VOQL -- All agreeded we need to work together – André Schaaff - Vizier Access to Catalogs As part of the VOTech project plans to include implementing Vizier catalogs as Sky. Nodes with ADQL access ** implications for the registry VOQL-Madrid October 7, 2005 4

Requested/Encouraged • Metadata – Please better metadata, otherwise little use • VOQL needs diversity – Portal supporting distributed queries! VOQL-Madrid October 7, 2005 5

Agreed • First, Get WD -> PR -> Rec • Finish WDs: – Nov 15 – Open for comments within WG: 2 weeks (end of Nov) – Promote to PR (needs at least a month) – Promote to Rec (needs approval from Exec) • Implement changes & Upgrade by – March 1 st VOQL-Madrid October 7, 2005 6

Roadmap 05 -06 (Oct – 7 th 05) • JVO will release a new Sky. Node toolkit in October ------on the tap for future ------ • The '!' operator problem. Need for proper footprints • More flexibility for XMATCH – How do we include errors? – new algorithms • • Sky. Node -> High level data access service? ADQL/x <–> ADQL/s what do we really need? Include VOStore – Async mech. Inclusion of simulated data access (with theory IG) • • • Jan 2006 Spring 2006 May 2006 Aug 2006 Autumn 2006 NVO demos reference implementation ? Inter. Op WS in Canada IAU Prague : VO Special Session Inter. Op WS in Russia VOQL-Madrid October 7, 2005 7