By J. -R. Abrial (auth.), Michael Butler, Michael G. Hinchey, María M. Larrondo-Petrie (eds.)

This e-book constitutes the refereed lawsuits of the ninth foreign convention on Formal Engineering tools, ICFEM 2007, held in Boca Raton, Florida, united states, November 14-15, 2007.

The 19 revised complete papers including invited talks provided have been conscientiously reviewed and chosen from 38 submissions. The papers deal with all present concerns in formal tools and their purposes in software program engineering. they're geared up in topical sections on safeguard and data, embedded platforms, checking out, automatic research, and concurrency.

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Extra info for Formal Methods and Software Engineering: 9th International Conference on Formal Engineering Methods, ICFEM 2007, Boca Raton, FL, USA, November 14-15, 2007. Proceedings

Example text

While predicate calculus is an important tool for formal software engineering methods, it cannot recreate many well known program specification formalisms. In this section the core concepts of DFP are used as the basis of a more general diagnostic framework that is independent of the underlying specification formalism. This new framework is called ‘Diagnosis from Formal Developments’ or DFD. A small set of formal properties of DFD are labeled as ‘Lemmas’. Proofs are given only for properties that do not follow immediately from definitions or previous lemmas.

De Groot P r. 221] as the conjunction of an ‘applicability’ and a ‘correctness’ condition can be induced from a canon consisting of discordance and the apply modality. − −×}. − −×}. − −×} d ∈ dom P ⇒ d ∈ dom Q ∧ (d ∈ dom P ∧ (d , r ) ∈ P ) ⇒ (d ∈ dom Q ∧ (d , r ) ∈ Q ) ≡ {Distribute implication over conjunction; Re-arrange antecedents} d ∈ dom P ⇒ d ∈ dom Q ∧ (d , r ) ∈ P ⇒ (d ∈ dom P ⇒ d ∈ dom Q ) ∧ (d ∈ dom P ∧ (d , r ) ∈ P ) ⇒ (d , r ) ∈ Q ≡ {Remove redundant implication} d ∈ dom P ⇒ d ∈ dom Q ∧ (d ∈ dom P ∧ (d , r ) ∈ P ) ⇒ (d , r ) ∈ Q ≡ {Re-arrange antecedents; Contraposition; Re-arrange antecedents} (d ∈ dom P ⇒ d ∈ dom Q ) ∧ ((d ∈ dom P ∧ (d , r ) ∈ Q ) ⇒ (d , r ) ∈ P ) ≡ {Set theory} (dom P ⊆ dom Q ) ∧ ((dom P £ Q) ⊆ P) By Lemma 3, DFD relational refinement implies fixing.

The PEP translates the request into the XACML request language and passes it on to the handler. In XACML a request is a triple containing multiple subjects, actions and resources. However, we will follow [7] and [6] in restricting request triples to contain a single subject, action and resource. We assume that the PEP is defined to break any compound request into a set of requests and submit them singly, then combine the results in whatever way the developer chooses. Formal Engineering of XACML Access Control Policies in VDM++ 39 Fig.

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