基于操作转换的协同图形编辑系统的研究和实现

本文提出的Co-XGrapht是基于操作转换的协同图形编辑系统。本文首先介绍了三个不一致性问题：分歧、因果违背、意图违背，以及相应的一致性模型。然后，本文提出了Co -XGraph的应用模型，并研究和实现了同时满足集中、因果保持、意图保持性质的并发控制算法。最后，本文展现了Co-XGraph在地理信息系统方面的应用前景，并列出了未来来需要继续开展的主要工作。

Research and Implementation of a Cooperative Graphic Editing System Based on Operational Transformation

The Co XGraph, presented by this paper, is a cooperative graphic editing system based on operational transformation. Three inconsistency problems of divergence, causality violation and intention violation in cooperative editing systems, and a consistency model are first introduced by this paper. Then, the application model of Co XGraph is presented, and a concurrency control algorithm that satisfies convergency, causality preservation, and intention preservation, is proposed. Finally, this paper presents the application prospect on GIS and lists the major future work.