Runtime execution of one or more tasks defined in a workflow process language. The method may include obtaining a description of the task from a process ontology (PO). The PO may define a hierarchical taxonomy of executable tasks, where each task refers to at least one frame of a hierarchical frame taxonomy of the PO. The method may further include identifying at least one parameter as described in the frame description to which the task refers, resolving the value of the at least one parameter, and executing the most specific applicable version of the task contained in the task taxonomy of the process ontology.