OData Futures: creating the web of data

1. SAC-824T OData Futures: creating the web of data Pablo Castro Software Architect Microsoft Corporation

2. Agenda • OData enhancements in upcoming version • Using OData from Windows 8 • Roadmap

3. Functionality. Efficiency. Versatility.

4. Functionality. Efficiency. Versatility.

5. Modeling and Querying: Location • First-class types in the model • Point, lines, line strings, polygon types • General geography and geometric types • “Distance” queries support • Extensible query capabilities • Represented using standard formats • GeoJSON, GML

6. Modeling and Querying: Collections • Before collections were top-level or associations only • Properties can now be collections • Primitives or complex types • New “any” and “all” operators • Predicates that work on collections • Through properties or associations

7. Modeling and Querying: Inheritance • Full inheritance support • No more obscure fine-print • Enables associations in subtypes • Use types in segments to refer to members of subtypes • Applies in path and all query operators

8. Functionality. Efficiency. Versatility.

9. Efficiency: Deltas • Incrementally refresh cached data • Adds “delta” link to responses • Server encodes what it needs there • Responses include new, updated and deleted entities • Backwards compatible

10. Efficiency: Wire Format

11. Efficiency: Cleaner and Leaner JSON • Optimize for network I/O • Payload size matters above all • Parsing time typically not a problem • Don’t get too weird • Plain JSON • Strategy • Templates for redundant information • Streamline compression in HTTP

12. Functionality. Efficiency. Versatility.

13. Modeling Behavior • “HATEOAS” • “Actions” have a name and a link • Server encodes what it needs in URLs • Availability depends on state • Server drives

14. Annotations and Semantics • Annotate any model construct • Annotations • Target • Term • Value • Terms can use global names • Shared vocabularies

15. Roadmap

16. Roadmap • OData protocol • New version draft by end of 2011 • WCF Data Services • New release in Q1 2012, covering most of next OData draft • Refresh with next version of Visual Studio

17. For more information RELATED SESSIONS DOCUMENTATION & ARTICLES • email: pablo.castro@microsoft.com • twitter: @pmc • Building data-driven HTML5 Applications with WCF RIA Services • Your Devices + OData + Azure == Happiness • F# 3.0: data, services, Web, cloud, at your fingertips • http://odata.org • http://msdn.microsoft.com/odata CONTACT

18. thank you Feedback and questions http://forums.dev.windows.com Session feedbackhttp://bldw.in/SessionFeedback

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