Cervera, J., van der Schaft, A. J., & Baños, A. (2007). Interconnection of port-Hamiltonian systems and composition of Dirac structures. Automatica, 43(2), 212–225. doi:10.1016/j.automatica.2006.08.014.
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Why this is here
A22 §6 took it as “an especially strong physical interpretation of gluing conditions”: constraints on actual flows of energy across an interface, which compose, and which do not by themselves dissipate or separate time scales. It bears on CLAIM-471 and CLAIM-473.