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'''rCOS''' stands for refinement of [[Object (philosophy)|object]] and [[Software component|component]] systems. It is a formal method [[component-based]] [[model-driven software]] development. It was originally developed by [[He Jifeng]], [[Liu Zhiming (computer scientist)|Zhiming Liu]] and [[Xiaoshan Li]] at [[UNU-IIST]], and consists of a unified multi-view modeling notation with a theory of relational semantic and graph-based operational semantics, a refinement calculus and tool support for model construction, model analysis and verification, and [[model transformation]]s. Model transformations automate refinement rules and design patterns and generate conditions as proof obligations. rCOS support multiple dimensional modeling: models at different levels of abstraction related by refinement relations, hierarchy of compositions of components, and models of different views of the system ([[interaction protocol]]s of components, reactive behaviors of components, data functionality, and class structures and data types). Components are composed and integrated based on their models of interfaces to support third party composition.
==References==
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*Ruzhen Dong, Johannes Faber, Wei Ke, Zhiming Liu: "rCOS: Defining Meanings of Component-Based Software Architectures". Unifying Theories of Programming and Formal Engineering Methods - ICTAC Training School on Software Engineering 2013, LNCS 8050: 1-66, Springer (2013)
*Wei Ke, Xiaoshan Li, Zhiming Liu, Volker Stolz: "rCOS: a formal model-driven engineering method for component-based software". ''Frontiers of Computer Science in China'' 6(1): 17-39 (2012)
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