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<p><b>Abstract</b>—Traditional IDLs were defined for describing the services that objects offer, but not those services they require from other objects, nor the relative order in which they expect their methods to be called. Some of the existing proposals try to add protocol information to object interfaces, but most of them fail to do so in a modular way. In this paper we propose an extension of the CORBA IDL that uses a sugared subset of the polyadic π-calculus for describing object service protocols, based on the concept of <it>roles</it>. Roles allow the modular specification of the observable behavior of CORBA objects, reducing the complexity of the compatibility tests. Our main aim is the automated checking of protocol interoperability between CORBA objects in open component-based environments, using similar techniques to those used in software architecture description and analysis. In addition, our proposal permits the study of substitutability between CORBA objects, as well as the realization of dynamic compatibility tests during their runtime execution.</p>
Interface definition languages, software components, component-based software development, protocols, compatibility and substitutability of components.

E. Pimentel, C. Canal, J. M. Troya, A. Vallecillo and L. Fuentes, "Adding Roles to CORBA Objects," in IEEE Transactions on Software Engineering, vol. 29, no. , pp. 242-260, 2003.
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