The keyword arguments that can be passed in a JsonImport constructor.
Note: This is not a real constructor, but just a description of the type of object that should be passed as
a parameter to some method(s), and/or the return value from some method(s).
In other words, the type exists only for documentation purposes, and you cannot call new _base.__JsonImportArgs()
See the dojox/geo/openlayers/_base.__JsonImportArgs reference documentation for more information.
The function called each time a feature is read. The function is called with a GeometryFeature as argument.