By João Leite (auth.), Matteo Baldoni, Jamal Bentahar, M. Birna van Riemsdijk, John Lloyd (eds.)
This ebook constitutes the completely refereed post-workshop lawsuits of the seventh overseas Workshop on Declarative Agent Languages and applied sciences, DALT 2009, held in Budapest, Hungary, on may possibly eleven, 2009, as a satellite tv for pc workshop of the eighth overseas Joint convention on independent brokers and Multiagent structures, AAMAS 2009.
The eleven revised complete papers offered including 1 invited lecture and three invited papers from the AAMAS major convention - considerably better after the workshop - have been rigorously chosen from 17 preliminary submissions. The papers mix declarative and formal ways with engineering and expertise points of brokers and multiagent structures and concentration specifically on parts reminiscent of the semantic internet, service-oriented computing, internet prone, defense, and digital contracting.
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Extra resources for Declarative Agent Languages and Technologies VII: 7th International Workshop, DALT 2009, Budapest, Hungary, May 11, 2009. Revised Selected and Invited Papers
The Refinement of Choreographed Multi-Agent Systems L˘acr˘amioara As¸tef˘anoaei1 , Frank S. de Boer1 , and Mehdi Dastani2 1 2 CWI, Amsterdam, The Netherlands Universiteit Utrecht, The Netherlands Abstract. This paper generalises the theory of agent refinement from  to multi-agent systems in the presence of new coordination mechanisms extended with real time. The generalisation is such that refinement is compositional. This means that refinement at the individual level implies refinement at the multi-agent system level.
The initial state cs0 has no invariant constraint and this means that an arbitrary amount of time can elapse in cs0 . The clock x is always reset with the transition from cs0 to cs1 . The invariant x < 5 associated with the state cs1 ensures that the synchronous actions clean and move(C, A, f loor) must be executed within 5 units of time. The guard x > 6 associated with the transition from cs2 to cs3 ensures that the agents cannot spend an indefinite time in cs2 because they must finish their tasks after 6 units of time.
Proposition 2. Given two multi-agent systems I1 , I2 such that (∀i1 ∈ I1 )(∃i2 ∈ I2 ) (msi1 ⊆ msi2 ) and a choreography as S c we have that S c ⊗ I1 ⊆ S c ⊗ I2 . The Refinement of Choreographed Multi-Agent Systems 27 Proof. Let M1 and M2 be the initial states of the multi-agent systems I1 and I2 . Let also cs0 be the initial state of the transition system S c associated to the choreography c. It is enough to notice that T r((cs0 , M1 )) = T r(cs0 ) ∩ T r(M1 ) and that msi1 ⊆ msi2 for all i1 ∈ I1 implies T r(M1 ) ⊆ T r(M2 ).