An approach to service composition using monotonic inheritance

OWL-S can´t provide sufficient support for automatic composition of Web services. An ontology model capable of overriding declaration and expressing virtual class is defined by introducing into a monotonic inheritance mechanism. A method and framework of automatic composition of Web services at knowledge level are proposed. The hierarchical matching from abstract to concretion in process ontology solves the task decomposing at high level and goal planning. Three kinds of comprehensive searching strategies are used to seek appropriate service from coarse granularity to thin granularity in turn.