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Change Feed. Web Feature Service / Filter Encoding Specification Features 22-SEP-2009 Panagiotis (Peter) A. Vretanos CubeWerx Inc. Conformance Classes. Exception Codes. HTTP status codes. Resource Reference Resolution. Xlink stuff replaced by resource reference resolution parameters

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  1. Change Feed Web Feature Service / Filter Encoding Specification Features 22-SEP-2009 Panagiotis (Peter) A. Vretanos CubeWerx Inc.

  2. Conformance Classes

  3. Exception Codes

  4. HTTP status codes

  5. Resource Reference Resolution • Xlink stuff replaced by resource reference resolution parameters • resolve (local | remote | all | none ) • resolveDepth • resolveTimeout • resolvePath • Xpath expression to indicate property path to resolve

  6. Paging • Triggered using the count parameter • Previous / next attribute in response point to next page of results and previous page of results • Can also use count / startIndex parameters <wfs:FeatureCollection previous=”http://www.myserver.com/wfs/...” next=”http://www.myserver.com/wfs/...” ...> ... </wfs:FeatureCollection>

  7. CRS Handling • Servers must follow OGC axis order manifesto • Mandatory supported CRS format is: urn:ogc:def:crs:EPSG::<code> • As per manifesto, coordinate order is set by the definition of the CRS

  8. Response Container • wfs:FeatureCollection has been enhanced to support: • wfs:AdditionalObjects that are required to satisfy resource resolution • Join tupple container, wfs:tupple, for responses to join queries

  9. Stored Queries • ListStoredQueries • DescribeStoredQueries • CreateStoredQueries • DropStoredQueries • Invocation using the GetFeatures request

  10. Create Stored Queries

  11. Invoke Stored Queries

  12. Capabilities Enhancements • Explicit declaration of conformance classes that the server supports • wfs:ExtendedDescription element that allows extensibility without having to change the schema

  13. New Operation - GetPropertyValue • Replaces the old GetGmlObject request • Response is a wfs:ValueCollection containing property values request (or parts thereof)

  14. GetPropertyValue Example

  15. Transaction Changes • New operation Replace • Rather than update on property at a time you can simply replace the entire features

  16. Versioning • Attribute “state” on wfs:member element allows version state of feature to be expressed • retired – feature has been deleted • superseded – feature has been superceeded by a newer version • valid – this is the current version of the feature • other:xxxx – server-specific versioned state • Changes to Filter to support version navigation

  17. Filter Changes • fes:Literals can now be typed • <Literal type="xs:date">1963-10-13</Literal> • Termporal operators • After, Before, Begins, BegunBy, Tcontains, During, EndedBy, Ends, TEquals, Meets, MetBy, Toverlaps OverlappedBy, Tintersects • Version navigation • first, last, all, next, previous • <ResourceId rid=”F1013” version=”FIRST”/> • <ResourceId rid=”F1013” startDate=”01-JAN-2009” endDate=”30_SEP-2009”/>

  18. Filter Changes (cont.) • fes:Function can now behave as operators so that Filter can be extended

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