TheProcess Specification Language (PSL) is a set oflogic terms used to describeprocesses. The logic terms arespecified in anontology that provides aformal description of the components and their relationships that make up a process. The ontology was developed at the National Institute of Standards and Technology (NIST), and has been approved as an international standard in the documentISO 18629.
The Process Specification Language can be used for the representation ofmanufacturing,engineering andbusiness processes, including production scheduling, process planning,workflow management,business process reengineering, simulation, process realization, process modelling, andproject management. In the manufacturing domain, PSL's objective is to serve as a common representation for integrating several process-related applications throughout the manufacturing processlife cycle.[1]
The foundation of the ontology of PSL is a set of primitiveconcepts (object, activity, activity_occurrence, timepoint), constants (inf+, inf-), functions (beginof, endof), andrelations (occurrence_of, participates_in, between, before, exists_at, is_occurring_at). This core ontology is then used to describe more complex concepts.[2] The ontology uses theCommon Logic Interchange Format (CLIF) to represent the concepts, constants, functions, and relations.[3]
This ontology provides a vocabulary of classes and relations for concepts at the ground level of event-instances, object-instances, and timepoints. PSL's top level is built around the following:[4]
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