IVOA Interop, Victoria Canada, May 20061 IVOA Data Access Layer Closing Plenary Summary, Victoria May 2006 Doug Tody (NRAO/NVO/IVOA) I NTERNATIONAL V IRTUAL.

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IVOA Interop, Victoria Canada, May IVOA Data Access Layer Closing Plenary Summary, Victoria May 2006 Doug Tody (NRAO/NVO/IVOA) I NTERNATIONAL V IRTUAL O BSERVATORY A LLIANCE

IVOA Interop, Victoria Canada, May SSA Discussions Data model –Great progress on architecture, components, utype –Still have concerns about closure, getting to a stable version Internal consistency within SSA V1.0 is the primary requirement –Agreed to initial focus on 1D Spectrum with associations –Longer term treatment of spectral aggregates is TBD

IVOA Interop, Victoria Canada, May SSA Discussions Protocol Versioning –Proposed to Explicitly version query, query response, capabilities Implemented with VERSION=X.Y parameter in query Runtime error reported if versions do not match –Concern expressed that this duplicates functionality of registry Conclusions –Service has no knowledge of registry, should function correctly independent of registry –Redundant checking and verification is a good thing –Semantics of VERSION need to be better defined e.g., version mismatch triggered only down to level 2 1.1, 1.2 would be a mismatch, 1.1.1, would not Note usual convention is.., not "1.12"

IVOA Interop, Victoria Canada, May SSA Discussions Service metadata –getCapabilities method proposed, no objections Will use GET-service-with-multiple-operations pattern Pattern contents after service metadata in registry but this interface is defined by the service, not the registry Pattern for GET service with multiple operations –no objections to proposed approach, e.g., REQUEST=queryData Range-list syntax approved –semantics, e.g., ordering, intersection, need to be clarified

IVOA Interop, Victoria Canada, May SIA Upgrade Planning Query interface –Basic parameter scheme and parameter set is agreed review names and naming conventions –Need to clarify detailed semantics what is mandatory or optional and what does this mean semantics such as a POS or TIME query on theory data Special Topics –Interface complexity, backwards compatibility Preserve 1.0 interface; can hopefully deprecate eventually Simple, basic interface for 2-D will always be provided –Time-based queries Essential functionality for e.g., solar data –Reviewed issues of complex data, access to cube data Generic dataset approach only option currently for complex data Support for cube data access is high priority Parameter-based interface with WCS is simple, should work

IVOA Interop, Victoria Canada, May Other DAL Protocols Spectral Line Access Protocol (SLAP) –Have V0.5 access protocol and data model –Third round of revisions this summer –Can probably go to V1.0 WD/PR by this fall Simple Numerical Access Protocol (SNAP) –Proposed by Theory IG for access to models –Basic approach reviewed –Theory IG will proceed with draft specification

IVOA Interop, Victoria Canada, May Updated DAL Roadmap SSA –Initial release supporting Spectrum 1.0WD July PR Moscow, fall 2006 –Add support for SED, TimeSeries Target PR for May 2007 SIA –Legacy V1.0 interface Promote to 1.0PR by Moscow interop, fall 2006 V1.0 interface will be preserved but eventually deprecated Simple/minimal service interface will be preserved indefinitely –SIA V2.0 Scope includes cube data access, async data staging/VOSpace Target 2.0 WD by May 2007 Promote to PR by fall 2007

IVOA Interop, Victoria Canada, May Updated DAL Roadmap SCS (Cone Search) –Legacy V1.0 interface –Promote to 1.0PR by Moscow interop, fall 2006 Generic Dataset –Develop during –Introduce ADQL integration here SLAP (Spectral Line Access) –Target 1.0PR fall SNAP (Numerical/Theory Data Access) –new, in initial draft stage in Theory IG