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As I already mentioned, CXF provides two interceptors: org.apache.cxf.ws.policy.PolicyInInterceptor and org.apache.cxf.ws.policy.PolicyOutInterceptor. These interceptors are responsible to load policy from destination, parse, merge them and add all associated interceptors into message interceptor chain. Functionality of policy interceptors are represented on the following figure:
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Briefly, policy interceptors make following steps:

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Additionally, CXF verifies satisfied policy assertions in PolicyVerfificationInInterceptor, PolicyVerificationInFaultInterceptor, PolicyVerificationOutInterceptor. If assertion is not processed and not satisfied in corresponded interceptor, than In- interceptors throw Fault and Out- interceptors provide appropriate log messages.
The practical using of WS-Policy is illustrated in ws_policy and ws_security CXF samples.
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