docs: def _buildElementTree(self,):
          """Turn object into an Element Tree
          """
  
          t_paging = ctree.Element('paging')
          t_paging.set('model', self.model)
          for key in self.__dict__.keys():
              if key != 'model':
                  t_tag = ctree.SubElement(t_paging, key)
                  for item in self.__dict__[key].items():
                      t_tag.set(*item)
  
          self.etree = t_paging
          return  t_paging