code: def resolveheaders(self, definitions, op):
          
          soap = op.soap
          headers = soap.input.headers + soap.output.headers
          for header in headers:
              mn = header.message
              ref = qualify(mn, self.root, definitions.tns)
              message = definitions.messages.get(ref)
              if message is None:
                  raise Exception, "message'%s', not-found" % mn
              pn = header.part
              for p in message.parts:
                  if p.name == pn:
                      header.part = p
                      break
              if pn == header.part:
                  raise Exception, \
                      "message '%s' has not part named '%s'" % (ref, pn)
docs: Resolve soap header I{message} references.
          @param definitions: A definitions object.
          @type definitions: L{Definitions}
          @param op: An I{operation} object.
          @type op: I{operation}