The importance of the Web service technology for business, government, among other sectors, is growing. Its use in these sectors demands security concern. The Web Services Security standard is a step towards satisfying this demand. However, in the current security approach, the mechanism used for describing security properties of Web services restricts security policy specification and ... [Show full abstract] intersection. In environments that include loosely-coupled components, a rich description of components is needed to determine whether they can interact in a secure manner. The goal of this paper is to propose a security approach for Web services, which combines Web Services Policy Framework policies and a Web Ontology Language ontology to overcome the limitation of the current syntactic approach. The main contribution of this paper is an extended approach based on semantics-enriched security policies.