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Comprehensive Development of VO Client Interfaces

Explore basic client development for HTTP VO services, tool building, and JAVA examples. Learn to manipulate VO responses and integrate standards. Future advancements include more web services and wrappers.

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Comprehensive Development of VO Client Interfaces

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Presentation Transcript

  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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