1. October 7, 2005VOQL-Madrid1 IVOA – VOQL WG session ESAC Villafranca del Castillo Madrid, Spain Friday, October 7th, 9:30 - 13:00 Yuji Shirasaki Maria Nieto-Santisteban

2. October 7, 2005VOQL-Madrid2 Agenda 1.Road Map (10’) –Where are we? –Meeting goals 2.Review ADQL and SkyNode specifications WD (10’) 3.Discuss schedule to upgrade SkyNodes from 0.7 to 1.0 4.Metadata. How enforce quality? --- BREAK ---- 5.Short presentations Brian Thomas - A VO Catalog model proposal André Schaaff - VizieR in the context of ADQL- SkyNode

3. October 7, 2005VOQL-Madrid3 Agenda 6. Future - Brief discussions (As time permits) –The '!' operator problem. Need for proper footprints. –VOQL needs diversity: equivalent implementations of Open SkyQuery portals accepting distributed queries –XMATCH function(s) algorithms (How do we include errors?) –How do we deal with big query results? The path to VOStore –XMatch works only between primary table from SkyNode What needs to be done to allow XMatch with others? –Table data model (standard column names) Where does Catalog Data Model WG stand? –Query by UCD and Utype –Theorists – How is theory data published and queried? 7. Update Road Map

4. October 7, 2005VOQL-Madrid4 Roadmap 05-06 (May – 20 th 05) May 16-20 2005 Interop Kyoto JunePrepare PR documents Jul (-- Aug ?)RFC AugVote by the Exec → Rec ADQL & SkyNode ------------ future version ------- Sept 2005First WD ADQL1.x –Integration of ADQL and DAL (with DAL) –X-Matcher (with DM/DAL) –Inclusion of simulated data access ? (with theory IG) Oct 2005 ADASS + IVOA InterOp Madrid, Spain –Discussion on the draft, and revise the WD Jan 2006NVO demos ? Spring 2006reference implementation ? May 2006InterOp WS in Canada Aug 2006 IAU Prague : VO Special Session Autumn 2006InterOp WS in Russia –To PR ????

5. October 7, 2005VOQL-Madrid5 Where are we? New since Kyoto Protocols: ADQL & SkyNodes WD 1.0? have been edited but NOT moved into PR Two new WD docs have been produced aiming simplification and minimize the impact of upgrades ADQL & DAL Integration: JVO plans to make a second release of the JVO SkyNode toolkit for building a Skynode with DAL integration and cross match functionality. (To be released after ADASS) NVO preliminary discussion about how to use ADQL to query DAL services http://dev.openskyquery.net has a prototype version of using Open SkyQuery to query SIAP services and display images

6. October 7, 2005VOQL-Madrid6 Where are we? (New since Kyoto) ADQL SQL Translation: ESAVO: ESA/ESAC has published a style sheet to translate between a subset of ADQL and SQL VO includes a Java translator for ADQL/s ADQL/x (To be released after ADASS) SkyNodes implementation: FULL SkyNode Java implementation was released for the second NVO Summer School in September 2005 Work has been started to implement a parallel system that will allow for Large-scale catalog and cross- match queries in Open SkyQuery

7. October 7, 2005VOQL-Madrid7 Roadmap 05-06 (May – 20 th 05) May 16-20 2005 Interop Kyoto JunePrepare PR documents Jul (-- Aug ?)RFC AugVote by the Exec → Rec ADQL & SkyNode ------------ future version ------- Sept 2005First WD ADQL1.x –Integration of ADQL and DAL (with DAL) –X-Matcher (with DM/DAL) –Inclusion of simulated data access ? (with theory IG) Oct 2005 ADASS + IVOA InterOp Madrid, Spain –Discussion on the draft, and revise the WD Jan 2006NVO demos ? Spring 2006reference implementation ? May 2006InterOp WS in Canada Aug 2006 IAU Prague : VO Special Session Autumn 2006InterOp WS in Russia –To PR ????

8. October 7, 2005VOQL-Madrid8 ADQL Specification Draft still needs some work Reduced the scope of SQL to the SELECT statement Defined a CORE and EXTENSIONs Defined the BNF independent from language (Post C# as an external reference) Included 2 “new/different” XMATCH function(s) –XMATCH -> XMATCH_chi2 (a, b, sigma) (keeps their parameters) –XMATCH_distance(c1a, c2a, c1b, c2b, ‘frame’)

9. October 7, 2005VOQL-Madrid9 SkyNode Specification Draft still needs some work Added more metadata information –ADQLExtension() -> supported extensions –Tables() -> added XMatchSupp and RegionSupp att. –Relation() -> TN1, CT1, TN2, CT2 –Column() -> (Indexed ?) Needed to add –Decouple cascade and parallel in the ExecPlan –Remove the XMatch algorithm out of the spec How do we do references –Add a mechanism to transmit "messages" in addition to data –Content standardization in returned VOTable Needed to modify –WSDL

10. October 7, 2005VOQL-Madrid10 Metadata How do we enforce it? SELECTSELECT t.TableName, t.Name, t.Unit, t.UCD, t.enum, t.description FROM FROM SHORTNAME:DBColumns tDBColumns

11. October 7, 2005VOQL-Madrid11 Metadata

12. October 7, 2005VOQL-Madrid12 Schedule to upgrade SkyNodes First, Get WD -> PR -> Rec Finish WDs: –Nov 15 –Open for comments within WD: 2 weeks (end of Nov) –Promote to PR (needs at least a month) –Promote to Rec (needs approval from Exec) Implement changes & Upgrade by –After AAS, other critical times? –March 1 st ?

13. October 7, 2005VOQL-Madrid13 Brief discussions The ! operator problem. Need for footprints SELECTSELECT o.objId, o.ra, o.dec, t.ra, t.dec, t.objId, o.typeobjIdradecradecobjIdtype FROM FROM SDSS:PhotoPrimary o, TWOMASS:PhotoPrimary t, USNOB:PhotoPrimary pSDSSPhotoPrimaryTWOMASSPhotoPrimaryUSNOBPhotoPrimary WHEREWHERE XMATCH(o, t, !p) < 3.5 AND Region('CIRCLE J2000 182.5 -0.89 8') AND o.type = 3Regiontype It is not the same nothing was found from nothing was there! => Either resolve the footprint or at least give a warning!!

14. October 7, 2005VOQL-Madrid14 Brief discussions VOQL needs diversity –Portal supporting distributed queries!

15. October 7, 2005VOQL-Madrid15 Brief discussions XMatch functions –How do we include error? –It works only between primary table What needs to be done to allow XMatch between others tables?

16. October 7, 2005VOQL-Madrid16 Brief discussion How do we deal with big queries?

17. October 7, 2005VOQL-Madrid17 Brief discussion Table data model? standard column names Querying by UCD / UType Where does Catalog Data Model WG stand?

18. October 7, 2005VOQL-Madrid18 Roadmap 05-06 (Oct – 7 th 05) JVO will release a new SkyNode 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 SkyNode -> 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 2006NVO demos Spring 2006 reference implementation ? May 2006InterOp WS in Canada Aug 2006 IAU Prague : VO Special Session Autumn 2006InterOp WS in Russia