code: def Add(self, rdf_value, timestamp=None, suffix=None, mutation_pool=None):
      
      return self.StaticAdd(
          self.collection_id,
          rdf_value,
          timestamp=timestamp,
          suffix=suffix,
          mutation_pool=mutation_pool)
docs: Adds an rdf value to the collection.
  
      Adds an rdf value to the collection. Does not require that the collection
      be locked.
  
      Args:
        rdf_value: The rdf value to add to the collection.
        timestamp: The timestamp (in microseconds) to store the rdf value at.
          Defaults to the current time.
        suffix: A 'fractional timestamp' suffix to reduce the chance of
          collisions. Defaults to a random number.
        mutation_pool: A MutationPool object to write to.
  
      Returns:
        The pair (timestamp, suffix) which identifies the value within the
        collection.
  
      Raises:
        ValueError: rdf_value has unexpected type.