IVOA DAL Madrid DAL WG Summary October 7

IVOA DAL - Madrid DAL WG Summary October 7, 2005 IVOA Interop, SL de El Escorial, Oct 2005 1

Simple Spectral Access (SSAP) • Reviewed revised query interface • Reviewed spectral data model • Reviewed Characterization usage • UTYPE usage issue discovered • Updated schedule – – Introduced in Kyoto (May); at least one early implementation (JHU SS) Agreement reaffirmed that basic query support time, spectral bandpass add optional 'name', 'mtime' query parameters unified specres, timeres, spatres parameters – – – "SED model" -> "spectral data model" agreed to provide equivalent support for Spectrum, SED, Time. Series action on Semantics to define standard "target. Class" list – – – minor discrepancies between SSA and DM versions Not fully implemented (sampling, flux characterization) will bring models into better agreement now that Char is stable – – DAL usage is fixed tag; no tie to XML technology form working group to resolve problem – – Draft V 1. 0 for discussion Dec 05 Advance to PR by May 06 IVOA Interop, SL de El Escorial, Oct 2005 2

Spectral Line Access (SLAP) • SLAP protocol presented, reviewed – consistent with other DAL interfaces – prototype implementations already exist (VOSpec) – minor enhancements to query interface suggested • e. g. , provide way to query forbidden lines only • Updated schedule – SLAP data model, access interfaces at V 0. 1 – will be released to DAL WG within a few days IVOA Interop, SL de El Escorial, Oct 2005 3

Simple Image Access (SIAP) • Plans for SIA V 1. 1 upgrade briefly reviewed – will be based mainly on SSA (query, query response) – extension mechanism well tested, several prototype apps exist • e. g. , CGPS radio data cube data • Very powerful, will permit advanced capabilities of many sorts – data staging still in technology investigation stage with GWS – Need for robust error handling, version control reaffirmed – Issue of one protocol or many discussed; need for object-specific protocols reaffirmed • Protocol Issues – consider error handling standards – how to step through large query responses – Coordinate these with GWS as they may be broader than DAL • Updated schedule – goal to have draft V 1. 1 interface for discussion by Feb 06 IVOA Interop, SL de El Escorial, Oct 2005 4

Implementations • Reference Implementations – – – Need for reference implementations discussed important to define standards separately from implementations required to develop complex access protocols required for service verification link to Registry to record service compliance, availability • Demonstrations – Detailed FOV using SIA extension mechanism, STC/XML, Aladin support – WCS+graphics using query response, Aladin support • VO-Client concept – required to provide high level functionality for analysis – Astrogrid, NVO implementations exist – example of using UTYPE for DM-based queries, query merging IVOA Interop, SL de El Escorial, Oct 2005 5