  The present paper provides an analysis of the existing proof systems for
dynamic epistemic logic from the viewpoint of proof-theoretic semantics.
Dynamic epistemic logic is one of the best known members of a family of logical
systems which have been successfully applied to diverse scientific disciplines,
but the proof theoretic treatment of which presents many difficulties. After an
illustration of the proof-theoretic semantic principles most relevant to the
treatment of logical connectives, we turn to illustrating the main features of
display calculi, a proof-theoretic paradigm which has been successfully
employed to give a proof-theoretic semantic account of modal and substructural
logics. Then, we review some of the most significant proposals of proof systems
for dynamic epistemic logics, and we critically reflect on them in the light of
the previously introduced proof-theoretic semantic principles. The
contributions of the present paper include a generalisation of Belnap's cut
elimination metatheorem for display calculi, and a revised version of the
display-style calculus D.EAK. We verify that the revised version satisfies the
previously mentioned proof-theoretic semantic principles, and show that it
enjoys cut elimination as a consequence of the generalised metatheorem.
