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Projection support was introduced between 7.x-2.0-beta3 and 7.x-2.0-beta4 of the OpenLayers module. In order to work towards cleaner code it was chosen to require providers of extensions to the OpenLayers module to adapt their layer and map definitions.
Rationale
There are various authorities/organizations who define projections. Thus there was the need to provide the authorities names in order to prevent ambiguities.