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Programming Self-Organizing Systems with the Higher-Order Chemical Language
Jean-Pierre Banâtre, Pascal Fradet and Yann Radenac

In a chemical language, computation is viewed as abstract molecules reacting in an abstract chemical solution. Data can be seen as molecules and operations as chemical reactions: if some molecules satisfy a reaction condition, they are replaced by the result of the reaction. When no reaction is possible within the solution, a normal form is reached and the program terminates. In this article, we introduce HOCL, the Higher-Order Chemical Language, where reaction rules are also considered as molecules. We illustrate the application of HOCL to the specification of self-organizing systems. We describe two case studies: an autonomic mail system and the coordination of an image-processing pipeline on a grid.

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