code: def update_node_count(self, node, add_to_count):
          
          current_score = 0
          count_string = self.parser.getAttribute(node, 'gravityNodes')
          if count_string:
              current_score = int(count_string)
  
          new_score = current_score + add_to_count
          self.parser.setAttribute(node, "gravityNodes", str(new_score))
docs: \
          stores how many decent nodes are under a parent node