1. SDMX Web Services the JSON version Sami Airo & Gerard Salou

2. Rubric www.ecb.europa.eu Agenda SDMX Web Services SDMX JSON Implementation: the ECB Tablet App 2

3. Rubric www.ecb.europa.eu SDMX WEB SERVICES 3

4. Rubric www.ecb.europa.eu4 SDMX RESTful web services Basic principles: Based on REST principles: –Resource addressability (URI) –Resource manipulation (HTTP GET, POST, etc) –Resource representation (HTTP content negotiation) Distinction between: –Parameters that identify a resource (in the path) –Parameters that further refine the results (in the query string)

5. Rubric www.ecb.europa.eu5 Structural metadata queries Retrieve any maintainable SDMX artefact => Data and metadata structure definitions, category schemes and categorisations, concept schemes, codelists and hierarchical codelists, organisation schemes, dataflow definitions, reporting taxonomies, provision agreements, structure sets, processes and constraints. Resolve direct references Retrieve minimal version of the artefact

6. Rubric www.ecb.europa.eu6 Data queries Retrieve statistical data and metadata using keys (with wildcarding and OR operator), flows and providers. Refine queries, using time information (start period and end period). Retrieve updates and revisions only. Retrieve how data have changed over time. Retrieve various amount of detail.

7. Rubric www.ecb.europa.eu Schema queries XML schemas are used to validate XML data files. Possibility to set a validation “context”(like DSD or dataflow). Possibility to return the schema for the data currently in production without the need to know the version number. 7

8. Rubric www.ecb.europa.eu8 Resource representation & HTTP content negotiation Selection of the appropriate format using HTTP Content Negotiation (Accept HTTP Header) Supported formats: –2 flavours of SDMX-ML –SDMX-JSON –2 flavours of CSV Compression Caching mechanism

9. Rubric www.ecb.europa.eu SDMX JSON 9

10. Rubric www.ecb.europa.eu AN APPLICATION: THE ECB TABLET APP 10

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19. Rubric www.ecb.europa.eu THANK YOU! 19