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basics.rst

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  1. .. _wfs_basics:
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  3. WFS basics
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  4. ==========
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  6. GeoServer provides support for the `Open Geospatial Consortium (OGC) <http://www.opengeospatial.org>`_ `Web Feature Service (WFS) <http://www.opengeospatial.org/standards/wms>`_ specification, versions **1.0.0**, **1.1.0**, and **2.0.0**. WFS defines a standard for exchanging vector data over the Internet. With a compliant WFS, clients can query both the data structure and the source data. Advanced WFS operations also support feature locking and edit operations.  
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  8. GeoServer is the reference implementation of all three versions of the standard, completely implementing every part of the protocol. This includes the basic operations of :ref:`wfs_getcap`, :ref:`wfs_dft`, and :ref:`wfs_getfeature`, as well as more advanced options such as :ref:`wfs_wfst`. GeoServer WFS is also integrated with its :ref:`security` system to limit access to data and transactions, and supports a variety of :ref:`wfs_output_formats`, making the raw data more widely available.
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  10. Differences between WFS versions
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  13. The major differences between the WFS versions are: 
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  15. * WFS 1.1.0 and 2.0.0 return GML3 as the default GML, whereas in WFS 1.0.0, the default is GML2. GML3 adopts marginally different ways of specifying a geometry. GeoServer supports requests in both GML3 and GML2 formats.
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  17. * In WFS 1.1.0 and 2.0.0, the SRS (Spatial Reference System, or projection) is specified with ``urn:x-ogc:def:crs:EPSG:XXXX``, whereas in WFS 1.0.0 the specification was ``http://www.opengis.net/gml/srs/epsg.xml#XXXX``. This change has implications for the :ref:`axis order <wfs_basics_axis>` of the returned data. 
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  19. * WFS 1.1.0 and 2.0.0 support on-the-fly reprojection of data, which supports returning the data in a SRS other than the native SRS. 
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  21. * WFS 2.0.0 introduces a new version of the filter encoding specification, adding support for temporal filters.
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  23. * WFS 2.0.0 supports joins via a GetFeature request.
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  25. * WFS 2.0.0 adds the ability to page results of a GetFeature request via the ``startIndex`` and ``count`` parameters. GeoServer now supports this functionality in WFS 1.0.0 and 1.1.0. 
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  27. * WFS 2.0.0 supports stored queries, which are regular WFS queries stored on the server such that they may be invoked by passing the appropriate identifier with a WFS request.
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  29. * WFS 2.0.0 supports SOAP (Simple Object Access Protocol) as an alternative to the OGC interface.
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  31. .. note:: There are also two changes to parameter names which can cause confusion. WFS 2.0.0 uses the ``count`` parameter to limit the number of features returned rather than the ``maxFeatures`` parameter used in previous versions. It also changed ``typeName`` to ``typeNames`` although GeoServer will accept either.
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