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Web service protocols are designed in XML formats so the message structures within are quite different from the conventional protocols. Therefore, the traditional formal verification techniques which have gain substantial achievements in practice, cannot be applied directly to them because their underlying models are written in AliceBob-style descriptions using high-level message formats instead of XML tags. In this paper, we propose a justification-oriented and automatic formal approach to verify, in the standard Dolev-Yao model, security properties expressed as epistemic notions for a Web service protocol, based on a fault-preserving mapping tool called SuD (SOAP under Dolev-Yao). Our approach can shed more light on Web service protocols in another perspective because the concerned properties to be verified are some inherent features of protocols.