Handlers manipulate primitive SOAPcontent directly, and are not aware of expected content as defined in WSDL.
处理程序直接操纵原始的SOAP内容，它并不知道在WSDL中定义的期望内容。
2
A WSDL document defines the service interface, and therefore the SOAPcontent, for both the request and the response.
WSDL文档定义了服务接口，因而也就定义了请求和响应的SOAP内容。
3
They are SOAP handlers in that message content is represented to the handler as SOAPcontent in the form of a SAAJ object (see the Resources section for more on these objects).