Service WSDL
A service WSDL follows the standard structure of a WSDL document.
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                    Namespace declarations 
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                    WSDL documentation, which includes the display name, description, operation name, description, and descriptions of request and response payload elements 
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                    Partner link definition 
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                    Security policy definition 
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                    Type definition through imports of XSDs 
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                    Message definition 
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                    Port type and operation definition 
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                    Binding definition 
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                    Service definition 
For example, the Sales Lead service interface is defined in the
                SalesLeadService.wsdl. For more information
            about WSDL specification, see http://www.w3.org/TR/wsdl.