Modeling versions in Web-based real-time cooperative edit system

The Web-based real-time cooperative edit system is an efficient working paradigm of CSCW, and it offers a function of editing a document at the same time by multiusers through a Web browser. Modeling versions is one of the most important technologies of the system. According to the characteristics of cooperative work, we define the version, world, context, entity, current version and relationship to modeling version. Then four kinds of meetings are presented, and the different characteristics of their record versions are discussed. The multi-version, dynamic and inter-related properties of the versions in meetings are analyzed. According to the system's version model, an instance is given.