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Cone, SIAP, and OpenSkyQuery Client Development

T HE US N ATIONAL V IRTUAL O BSERVATORY. Cone, SIAP, and OpenSkyQuery Client Development. Gretchen Greene, Maria Nieto-Santisteban. This session explores. Basic client development for standard http VO services How-to for building tools, applications

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Cone, SIAP, and OpenSkyQuery Client Development

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  1. THE US NATIONAL VIRTUAL OBSERVATORY Cone, SIAP, and OpenSkyQuery Client Development Gretchen Greene, Maria Nieto-Santisteban NVO Summer School

  2. This session explores • Basic client development for standard http VO services • How-to for building tools, applications • JAVA examples provided in course nvoss\dev files • Cone client, SIAP client, and skyportalclient tutorial on the Twiki site (from SS program) • http://chart.stsci.edu/twiki/bin/view/Main/SummerSchoolClientSide • http://chart.stsci.edu/twiki/bin/view/Main/SummerSchoolSIAPClient • Basic Web service clients • How to manipulate standard VO response • XML VOTable parsing • SIAP output FITS • Assumes some prior knowledge of service availability • Registries integration for locating services will be discussed tomorrow (Plante/Graham) NVO Summer School

  3. Current Client interfaces to VO protocols • VO DAL (Data Access Layers) returning VOTables • Cone Search: http Catalog access • Simple Image Access Protocol (SIAP) • http retrieves image references • Simple Spectral Access Protocol (SSAP) still beta and not presented here • OpenSkyQuery portal • Web service (SOAP) programmatic interface removes limitations of portal • Returns classes and operations including VOData NVO Summer School

  4. HTTP protocol PROS • HTTP Interfaces return a standard VOTable • IVOA standard (current Version 1.1) • Several parsers exist: JAVOT, SAVOT, Perl, C++ http://www.ivoa.net/twiki/bin/view/IVOA/VOTableSoftware#Parsers • Suite of compatible tools available: http://www.ivoa.net/twiki/bin/view/IVOA/VOTableSoftware#Applications • Language independent: network protocol based • cgi is easy to implement NVO Summer School

  5. HTTP protocol CONS • Returns only VOTables • Limitedsimplistic Metadata, i.e. fields, UCDs, etc. • Registries will contain more meta information yet still dependent on standard exchange • VOResource Schema design • description level of resources/services: • e.g. Invocation methods, resource Relationships, coverage,+ • Requires parsers • Query input parameter limited • ra,dec,sz NVO Summer School

  6. Future for Client Development • Continue to support basic http protocols: Cone, SIAP, SSAP • More Web service / SOAP based • Contemplate DALs with Web service protocols • Wrappers for legacy services • Newer tech • OpenSkyQuery-like tools • XSD schema can use WSDL to class auto-generation tools • language interoperability • Receiving classes instead of fixed tables • Complex Clients • Science applications which integrate multiple basic clients • Integrate VO standards with new and existing tools NVO Summer School

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