def update(self, **kwargs):
        return 0
serialize(dom, element) -> None 
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/db/models/query.py/EmptyQuerySet.update--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/core/vistrail/module_param.py/ModuleParam.serialize