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FSL – Fibred Security Language Genovese, Valerio Gabbay, Dov M. Boella, Guido van der Torre, Leendert Access Control Trust Management Fibring Logics We develop a fibred security language capable to express statements of the form begin{center} ${x }varphi (x) says psi$ end{center} where ${x}varphi (x)$ is the set of all $x$ that satisfy $varphi$ and $psi$ is any formula. $varphi$ and $psi$ may share several free variables. For example, we can express the following: "A member $m$ of the Program Committee can not accept a paper $P_1$ in which one of its authors says that he has published a paper with him after 2007" begin{center} $ eg({m} [PC(m) wedge {y}author\_of(y,P_1) extbf{ says } exists p(paper(p) wedge author\_of(m,p) wedge author\_of(y,p) wedge year(p) geq 2007)] extbf{ says } accept(P_1))$ end{center} Schloss Dagstuhl – Leibniz-Zentrum für Informatik Valerio Genovese and Dov M. Gabbay and Guido Boella and Leendert van der Torre 2009 Is Part Of Dagstuhl Seminar Proceedings, Volume 9121, Normative Multi-Agent Systems (2009) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/DagSemProc.09121.16 urn:nbn:de:0030-drops-19083 https://drops.dagstuhl.de/entities/document/10.4230/DagSemProc.09121.16 eng https://creativecommons.org/licenses/by/4.0/legalcode