In this paper, we unify the theory of SSD spaces and the theory of strongly
representable sets, and we apply our results to the theory of the various
classes of maximally monotone sets. In particular, we prove that type (ED),
dense type, type (D), type (NI) and strongly representable are equivalent
concepts and, consequently, that the known properties of strongly representable
sets follow from known properties of sets of type (ED).