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Service-oriented computing has been obtaining more and more attention recently. Current works mainly concentrate on the service products and the standards to realize service-oriented computing. An important unaddressed problem is service-oriented modeling that is one of the fundamental elements you need to support SOA. This paper proposes an ontology-based approach for service-oriented modeling. This approach introduces hierarchical ontology systems in specific domain, which not only facilitate service reuse, but also facilitate reuse of application templates, collaboration patterns and workflows. This paper also presents an iterative process for service-oriented modeling.