code: def __resolveport(self, definitions):
          
          ref = qualify(self.type, self.root, definitions.tns)
          port_type = definitions.port_types.get(ref)
          if port_type is None:
              raise Exception("portType '%s', not-found" % (self.type,))
          # Later on we will require access to the message data referenced by
          # this port_type instance, and in order for those data references to be
          # available, port_type first needs to dereference its message
          # identification string. The only scenario where the port_type might
          # possibly not have already resolved its references, and where this
          # explicit resolve() call is required, is if we are dealing with a
          # recursive WSDL import chain.
          port_type.resolve(definitions)
          self.type = port_type
docs: Resolve port_type reference.
  
          @param definitions: A definitions object.
          @type definitions: L{Definitions}