"Wrapped" style is an undocumented convention, so there are no hard and fast rules governing the style. "Wrapped" is a convention used with Document/Literal style services. When using Document/Literal, a WSDL <message> definition contains only one <part> definition for the SOAP body, and that part must reference an <element> defined in the <types> section. In the case of an output message, the <element> defines a wrapper structure for the return value and any output parameters. The format of each output parameter on the wire is governed by the schema structure you define in the <element> definition.
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