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This provides the useful ability to restrict access to data since only a picture of the data is sent to the user and the high quality vector or raster data remains safe on the server. This is in sharp contrast to a Web Feature Server( WFS) which returns the features of the data as features.
The web map server specification is defined by the Open GIS Consortium and can be found at [1].
-- 19:20, 28 Jul 2004 (UTC)