Workflows offer scientists a simple but flexible programming model at a level of abstraction closer to the domain-specific activities that they seek to perform. However, languages for describing workflows tend to be highly complex, or specialized toward a particular domain, or both. WOOL is an abstract workflow language with human-readable syntax, intuitive semantics, and a powerful abstract type system. WOOL workflows can be targeted to almost any kind of runtime system
supporting data-flow computation. This paper describes the design of the WOOL language and the implementation of its compiler, along with a simple example runtime. We demonstrate its use in an image-processing workflow.
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