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Cyber-physical systems (CPS) are networks of computational and physical processes, often containing human actors. In a CPS-setting, the computational processes collect information on their physical environment via sensors, and react upon via actuators in order to reach a desired state of the physical world.In the approach presented in this paper a CPS application is implemented as a hierarchical workow of mostly independent tasks, which are executed in a distributed environment, and satisfy timing constraints. In certain cases such workows can be defined from natural language descriptions with the use of ontologies. The structure of a workow, as well as the constraints put on the constituting tasks, are expressed in a domain-specific programming language.

2010 Mathematics Subject Classification. 68N15, 68M14.1998 CR Categories and Descriptors. D3.2 [Programming Languages]: Language Classifications - Applicative (functional) languages, Concurrent, distributed, and parallel languages.

Key words and phrases. cyber-physical system, task-oriented programming, workow, timing constraint, domain specific language.This paper has been presented at the International Conference KEPT2013: Knowledge Engineering Principles and Techniques, organized by Babeș-Bolyai University, Cluj-Napoca, July 5-7 2013.