11 F.Bonnarel (CDS) Kyoto IVOA Interoperabilty Meeting DAL: a mechanism for Metadata extensions F.Bonnarel In behalf of T.Boch, M. Louys, P.Fernique (CDS)

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Presentation transcript:

11 F.Bonnarel (CDS) Kyoto IVOA Interoperabilty Meeting DAL: a mechanism for Metadata extensions F.Bonnarel In behalf of T.Boch, M. Louys, P.Fernique (CDS) J.Salgado, P.Osuna (ESAC), A. Micol (ECF), D.Durand (CADC)

22 F.Bonnarel (CDS) Kyoto IVOA Interoperabilty Meeting A-Motivations SIA 1.0 was a large progress but soon considered limited in some cases. Organised Data collections ( IDHA/Metadatatree in AVO prototype and Aladin) Structured Observations (XMM at ESAC) Linked Observations (HST Associations) Radio Cubes ( CGPS) -> Query response format has to help the client software to organize the metadata

33 F.Bonnarel (CDS) Kyoto IVOA Interoperabilty Meeting B- DAL Metadata Extensions: Previous discussions Discussion started in IVOA Cambridge UK (2003) Cambrige (MA) 2004: ESAC note Cambridge (MA) 2004: CDS note (first proto) September 2004: Proposal merge Pune: Common presentation (Fernique et al, second prototype) April 2005: new note by Bonnarel, Boch, Fernique, Louys, Osuna, Salgado Basic ID= Query response has a first RESOURCE similar to SIA 1.0 or SSA 0.1 (SSA 0.9). + additional RESOURCES coming after. Reference mechanism.

44 F.Bonnarel (CDS) Kyoto IVOA Interoperabilty Meeting C-Demo XMM : pre cooked SIA/Extension file CGPS: a beta version service HST Associations: an experiment with Characterization (and Observation) DM utypes

55 F.Bonnarel (CDS) Kyoto IVOA Interoperabilty Meeting D- How does it work? 3 features: A main RESOURCE (can be SIA 1.0, SIA 1.1 or SSA ?.?) + Extension RESOURCE(S) Utypes on FIELDS,GROUPS, TABLE, RESOURCE help the software to know what to do with the associated metadata. Use of ID/ref help to link VOTABLE elements and provides an INDEX mechanism. Could also work with pure XML structures (xpath)

66 F.Bonnarel (CDS) Kyoto IVOA Interoperabilty Meeting Conclusions CGPS service will be soon released. 1st priority: Implementation of field of view as Characterization support/ STC coordArea New test project: cfhtls Modify and upgrade the IVOA Note to a Working-draft status Open to other implementations