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Dear Iknur

These GEs were specified and named before we made major changes to the FIWARE architecture, leading to a clearer separation of the Edge and backend parts of FIWARE implementations (gateway was the initial name for a subset of what we now call edge). I consider both of them to be deprecated and their functions to be taken over by the new IDEC GE, of which Cepheus is an implementation. Highlighting Cepheus as an edge enabler should make its differentiation with Perseo clear enough. Perseo and Cepheus are both based on the Esper CEP core, but, as an edge enabler, IDEC/Cepheus does more than CEP.