TY  - CONF
ID  - deploy399
UR  - http://www.informatik.uni-trier.de/~ley/db/conf/fmco/fmco2010.html
A1  - Silva, Renato
A1  - Butler, Michael
Y1  - 2010/11//
N2  - The construction of specifications is often a combination of smaller sub-components. Composition and decomposition are techniques that support reuse and allow us to formally combine sub-components through refinement steps while reusing their properties. Sub-components can result from a design or architectural goal and a refinement framework should allow further parallel development over the sub-components. We propose the definition of composition and decomposition in the Event-B formalism following a shared event approach where sub-components interact via synchronisation over shared events and shared states are not allow. We define the necessary proof obligations to ensure a valid composition or decomposition.  We also show that shared event composition preserves refinement proofs for sub-components, that is, in order to maintain refinement of compositions, it is sufficient to prove refinement between corresponding subcomponents.  A case study applying these two techniques is illustrated using Rodin, the Event-B toolset.
TI  - Shared Event Composition/Decomposition in Event-B
AV  - public
M2  - Graz, Austria
T2  - Formal Methods for Components and Objects 2010
ER  -