We introduce two forms of modelling of systems that consist of objects that are combined together by the means of bonds. In reaction systems for bonding we define how bonds are created and dissolved via reduction-style semantics. The usefulness of reaction systems is illustrated with examples taken from software engineering and biochemistry. We also introduce reversible event structures and define the notion of configuration. We then discuss how to give semantics of reaction systems for bonding in terms of reversible event structures.
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