Versioning of Multi-Data Objects in Multi-Devices

This paper presents a version control method on multi-data objects from multi-devices. As various types of devices are widely used these days, most people use more than one kind of personal devices. Data are copied in multiple devices. However, it is hard to maintain consistency of the data in different devices and they are usually in different versions. In order to keep versions of multiple data objects in multiple devices, version control mechanism among multi-devices is needed. The version model suggested in this paper introduces operations to control data object versions.