Abstract
Let p t {p_{t}} , t > 0 t > 0 , be a strongly continuous submarkovian semigroup on a real Hilbert space L 2 ( X , m ) {L^2}(X, m) . The measure m is assumed to be excessive and the L 2 {L^2} generator A is assumed to satisfy an estimate (the sector condition) which permits the application of Dirichlet spaces (not necessarily symmetric). Other submarkovian semigroups P t ∼ P_t^ \sim with the same local generator and cogenerator and relative to which m is again excessive are classified in terms of generators for processes which live on a suitable boundary.

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