Defines a transformed attribute to be used in
A data store wrapped around a
A feature source that can transform a source feature source using a set of expressions Usages: hide, rename fields - compute new fields build geom from x,y (we need to add a new Point filter function and have a special treatment of it in simplifying filter visitor so that it turns bbox filters against it into a filter on x,y) on the fly simplification for WFS (just use environment variables) and in general dynamic processing based on params without stored queries
A transforming feature store, will transform on the fly all attempts to write so that the underlying features are getting modified while exposing a different feature type to its callers.
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