def create_change_op_chain(old_obj, new_obj, parent=(None,None)):
    ops = vistrails.db.services.action.create_change_op_chain(old_obj, new_obj, parent)
    convert_operation_list(ops)
    return ops
create_change_op_chain(old_obj: object, new_obj: object, 
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/core/db/io.py/create_change_op_chain