@property
  def instance_key(self):
    if self.__pb.has_clone_key():
      return self.__pb.clone_key()
    return None
extraSource allows you to append a source list item that is
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/logservice/logservice.py/RequestLog.instance_key--crossover with--dataset/ETHPy150Open sassoftware/conary/conary/build/recipe.py/Recipe.extraSource