code: def addInHeaderInfo(self, name, type, namespace, element_type=0,
                          mustUnderstand=0):
          
          headerinfo = HeaderInfo(name, type, namespace, element_type)
          if mustUnderstand:
              headerinfo.mustUnderstand = 1
          self.inheaders.append(headerinfo)
          return headerinfo
docs: Add an input SOAP header description to the call info.