docs: def Add(self, rdf_value, mutation_pool=None):
      """Adds an rdf value to the queue.
  
      Adds an rdf value to the queue. Does not require that the queue be locked.
  
      Args:
        rdf_value: The rdf value to add to the queue.
  
        mutation_pool: A MutationPool object to write to.
  
      Raises:
        ValueError: rdf_value has unexpected type.
  
      """
      self.StaticAdd(self.urn, rdf_value, mutation_pool=mutation_pool)