Real-time Collaborative Editors (RCE) are a class of distributed sys- tems based on the interaction of several users trying to edit simultaneously shared documents, such as articles, wiki pages and programming source code. Oper- ational Transformation (OT) is considered as the efficient and safe method for consistency maintenance in the literature of collaborative editors. Indeed, it is aimed at ensuring copies convergence even though the users’s updates are ex- ecuted in any order on different copies. Unfortunately, existing OT algorithms often fail to achieve this objective.Moreover, these algorithms have limited scal- abilitywith the number of users as they use vector timestamps to enforce causality dependency. In this paper, we present a novel coordination model for managing collaborative editing work in a scalable and decentralized fashion. It may be de- ployed easily on P2P networks as it supports dynamic groups where users can leave and join at any time.
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