Abstract. TAPAAL 2.0 is a platform-independent modelling, simulation and verification tool for extended timed-arc Petri nets. The tool supports component-based modelling and offers an automated verification of the EF, AG, EG and AF fragments of TCTL via translations to Uppaal timed automata and via its own dedicated verification engine. After more than three years of active development with a main focus on usability aspects and on the efficiency of the verification algorithms, we present the new version of TAPAAL 2.0 that has by now reached its maturity and offers the first publicly available tool supporting the analysis and verification of timed-arc Petri nets.

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Abstract. We consider asynchronously composed I/O-Petri nets (AIOPNs) with built-in communication channels. They are equipped with a compositional semantics in terms of asynchronous I/O-transition systems (AIOTSs) admitting infinite state spaces. We study various channel properties that deal with the production and consumption of messages exchanged via the communication channels and establish useful relationships between them. In order to support incremental design we show that the channel properties considered in this work are preserved by asynchronous composition, i.e. they are compositional. As a crucial result we prove that the channel properties are decidable for AIOPNs.