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Delayed-Choice Semantics for Pomset Families and Message Sequence Graphs

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ModelEd, TestEd, TrustEd

Part of the book series: Lecture Notes in Computer Science ((LNPSE,volume 10500))

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Abstract

Message sequence charts (MSCs) are diagrams widely used to describe communication scenarios. Their higher-order formalism is provided by graphs over MSCs, called message sequence graphs (MSGs), which naturally induce a non-interleaving linear-time semantics in terms of a pomset family. Besides this pomset semantics, an operational semantics for MSGs was standardized by the ITU-T as an interleaving branching-time semantics using a process-algebraic approach. A key ingredient in the latter semantics is delayed choice, formalizing that choices between communication scenarios are only made when they are inevitable. In this paper, an approach towards branching-time semantics for pomset families that follows the concept of delayed choice is proposed. First, transition-system semantics are provided where global states comprise cuts of pomsets represented either by suffixes or prefixes of family members. Second, an event-structure semantics is presented those benefit is to maintain the causal dependencies of events provided by the pomset family. These semantics are also investigated in the context of pomset families generated by MSGs.

The authors are supported by Deutsche Telekom Stiftung, by the DFG through the Collaborative Research Center SFB 912 – HAEC, the Excellence Initiative by the German Federal and State Governments (cluster of excellence cfAED), the DFG-projects BA-1679/11-1 and BA-1679/12-1, and the 5G Lab Germany.

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Notes

  1. 1.

    The cited papers focus on high-level MSCs, i.e., MSGs which in addition allow for a hierarchical structure and parallel composition. As high-level MSCs can be unfolded into an MSG [2] without changing their operational semantics, we disregard the parallel composition operator and focus solely on MSGs in this paper.

  2. 2.

    Note that we overload the function \(\mathfrak {lang}\) for transition systems and pomset families.

  3. 3.

    Note that \(\mathrm {Suff}_\alpha (\mathcal {Y})\) is a singleton as we assume pomsets to be not autoconcurrent.

  4. 4.

    Recall that determinism depends only on the reachable part in \(\mathcal {T}_{\mathrm {suff}}[\mathfrak {P}]\).

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Acknowledgements

The authors thank Arend Rensink and Joost-Pieter Katoen for their valuable comments on this paper.

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Dubslaff, C., Baier, C. (2017). Delayed-Choice Semantics for Pomset Families and Message Sequence Graphs. In: Katoen, JP., Langerak, R., Rensink, A. (eds) ModelEd, TestEd, TrustEd. Lecture Notes in Computer Science(), vol 10500. Springer, Cham. https://doi.org/10.1007/978-3-319-68270-9_4

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