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In silico scientific experiments encompass multiple combinations of program and data resources. Each resource combination in an execution flow is called a scientific workflow. In bioinformatics environments, program composition is a frequent operation, requiring complex management. A scientist faces many challenges when building an experiment: finding the right program to use, the adequate parameters to tune, managing input/output data, building and reusing workflows. Typically, these workflowsdoi:10.1016/j.datak.2004.06.013 fatcat:cpoe6ozfbva7xcmfp2q73ub3am