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Download services

This workshop discusses the various download services and implementing rules for network services. Topics covered include definitions, dataset formats, metadata catalogues, and encoding formats.

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Download services

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  1. Download services Olaf Østensen Network Services Drafting Team EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  2. Directive text EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  3. Directive text What does ”where practicable” mean? EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  4. Definitions EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  5. Definitions • Dataset • one or more physical files serialized in an encoding format • database realized in a concrete database system • part of one of the above specified by some filter (query, … ) EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  6. Modelling principle - MDA Model Driven Architecture EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  7. Simplified picture Member state data Harmonised MS data – real or ’virtual’ Harmonised GML schemas Download WCS File w/filter WFS File EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  8. Important background documents • D2.5 DT DS Generic Conceptual Model • D2.6 DT DS Methodology for the development of data specifications • D2.7 DT DS Guidelines for the encoding of spatial data EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  9. New requirements from D2.7 - i) NB! Numbering is wrong – due to copying EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  10. New requirements from D2.7 - ii) NB! Numbering is wrong – due to copying EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  11. New requirements from D2.7 - iii) NB! Numbering is wrong – due to copying EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  12. Generic use caseWorkflow • Discover using a discovery service on metadata • Select desired dataset(s) • Apply filter – F – for identifying part of selected datasets (if appropriate) • Download using one or more download services defined by the implementing rule EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  13. Metadata catalogue network discovery service Discover selection process – not specified Select filter ‘service’ Filter, query download service Download ArchivesRepositories EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  14. Tools • discovery service - DT-NS • harmonizedapplication schemas - DT-DS • filter encoding - OGC/ISO • web feature service - OGC/ISO • GML - OGC/ISO • web coverage service - OGC • ftp- and http-protocol - IETF • web services - W3C EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  15. More precise … EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  16. Download Implementing Rule 1 • Full dataset download based upon discovery • normally implemented through a discovery client • find, select, download using http • need to find out exactly what needs to be specified and how • Variant: direct ftp or http on a directory of a repository (?) EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  17. IR 1 – Full dataset download EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  18. Encoding – only GML? It is required that the server provide the relevant MIME-type, e.g. in the case of a GML 3.2.1 dataset, MIME type text/xml; subtype=gml/3.2.1, Discussion: Should dataset formats be restricted to an INSPIRE basket of different formats. I guess this is in the hands of DT-DS? This implementing rule is very naïve in a way, but I am unsure to what extent we need to go into technicalities for this type of service that we all do every day, and which is intrinsically built into our computing environments. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  19. Download Implementing Rule 2 • Partial dataset download based upon discovery and filter • As the previous but with addition of a filter condition using FE • reliant upon FE and harmonized application schema • do we need a simplified FE (profile), e.g. independent of harmonized application schema • do we need this rule at all? EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  20. IR 2 – Partial file download EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  21. Download Implementing Rule 3 • Partial (extreme case: full) download based upon WFS including FE • FE specification input based on harmonized application schema • GML output according to harmonized application schema • profiling based on • CRSes • ?? EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  22. Nota Bene • Web Feature Service is under development in a joint OGC – ISO/TC 211 effort, leading to ISO 19142 – parallell voting in CEN • Similar for Filter Encoding, leading to ISO 19143 • ISO 19142 and ISO 19143 will with almost certainty become ENs – i.e. European standards • It is currently under consideration which versions the IR will be based upon EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  23. IR basis IR basis Proposal: IR require only basic WFS – probably not sufficient due to new requirements from D2.7 It shall be required that the server supports – and reports in the getCapabilities – the same set of SRS that is required for the View service. It is thus required that the server can transform to these SRS’es on the fly. EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  24. IR basis New version ? EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  25. Download Implementing Rule 4 • Partial (extreme case: full) download based upon WCS including FE • FE specification input based on harmonized application schema • GML output according to harmonized application schema • profiling based on • CRSes EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  26. WFS To SOAP or not to SOAP … • SOAP is not relevant forfile download • ISO/CD 19142 (latest revision) contains a fragmentary description of SOAP binding in an informative annex(the same applies for WFS 1.1.0 clause 6.7) • SOAP and GML – a problem? • So … ?? EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

  27. Next steps in the Work Programme EuroGeographics Workshop Network Service, Paris, 2008-02-05/06

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