In: Membrane Computing, Revised Papers of the International Workshop, WMC-CdeA 2002, Curtea de Arges, Romania, August 19-23, 2002, pages 352-359. Volume 2597 of Lecture Notes in Computer Science / G. Paun, G. Rozenberg, A. Salomaa, C. Zandron (Eds.) --- Springer Verlag, February 2003.
Abstract: We define, in an inductive way, structured multisets, as well as Chomsky-like productions for such higher order multisets. The usefulness of the approach for Petri nets and membrane computing is briefly discussed.