code: def build_params(self, params, i):
          
          prefix = 'Tags.member.%d.' % i
          params[prefix+'ResourceId'] = self.resource_id
          params[prefix+'ResourceType'] = self.resource_type
          params[prefix+'Key'] = self.key
          params[prefix+'Value'] = self.value
          if self.propagate_at_launch:
              params[prefix+'PropagateAtLaunch'] = 'true'
          else:
              params[prefix+'PropagateAtLaunch'] = 'false'
docs: Populates a dictionary with the name/value pairs necessary
          to identify this Tag in a request.