A semantic-web-services platform that uses OWL (Web Ontology Language) to allow data and service providers to semantically describe their resources using third-party ontologies is SSWAP: Simple Semantic Web Architecture and Protocol.
Services are semantically discoverable based on their subsumption hierarchies as well as their input and output data types.
SADI Services natively consume data in RDF Resource Description Framework format, where input and output data must be instances of (OWL Individuals of) input and output Classes defined in OWL-DL.
Thus, chaining SADI services together into a workflow results in an uninterrupted Linked Data graph.
Orchestration deals with describing how a number of services, two or more, cooperate and communicate with the aim of achieving a common goal.