I. Introduction
Distributed parameter systems described by partial differential equations arise in systems theory from a modeling and a control theoretic point of view and are without doubt a challenging research problem, where lot of progress has been achieved in the last years. Also the port-Hamiltonian setting, originally developed in the finite dimensional scenario has been transfered to infinite-dimensional systems, where e.g. the well-known approach based on (Stokes-)Dirac structures (also known from the lumped parameter scenario) is available, see e.g. [1], [2], [3], [4], [5], [6] and references therein.