code: def resolvesoapbody(self, definitions, op):
          
          ptop = self.type.operation(op.name)
          if ptop is None:
              raise Exception, \
                  "operation '%s' not defined in portType" % op.name
          soap = op.soap
          parts = soap.input.body.parts
          if len(parts):
              pts = []
              for p in ptop.input.parts:
                  if p.name in parts:
                      pts.append(p)
              soap.input.body.parts = pts
          else:
              soap.input.body.parts = ptop.input.parts
          parts = soap.output.body.parts
          if len(parts):
              pts = []
              for p in ptop.output.parts:
                  if p.name in parts:
                      pts.append(p)
              soap.output.body.parts = pts
          else:
              soap.output.body.parts = ptop.output.parts
docs: Resolve soap body I{message} parts by 
          cross-referencing with operation defined in port type.
          @param definitions: A definitions object.
          @type definitions: L{Definitions}
          @param op: An I{operation} object.
          @type op: I{operation}