docs: def parse_yaml(self, node):
          '''Parse a YAML specification of a component group into this
          object.
  
          '''
          self.group_id = y['groupId']
          self._members = []
          if 'members' in y:
              for m in y.get('members'):
                  self._members.append(TargetComponent().parse_yaml(m))
          return self