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Web Service Annotation Framework4 for semiautomatic annotation of Web Services' semantics addressing four different aspects:
- Semantics of the inputs and outputs of Web Services,
- Functional semantics (“what service does”),
- Execution semantics to support verification of the correctness of the Web Service executions, and
- Inclusion of information regarding the quality of service (performance, costs, …).
Semiautomatic annotation is based on
- Transformation of both XML Schema part of Web Service definitions and ontologies into a common representation – SchemaGraph, and
- Matching algorithms which compute “match score” between the SchemaGraph elements.
The framework comprises:
- Ontology store – ontologies to be used during Web Service annotation,
- Matcher library – algorithm implementations for linguistic and structural matching and
- Translator library – SchemaGraph generation procedures.

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