Various advantages of XML such as flexibility and interoperability have given rise to a steady increase in the number of software documents using XML, and this growth has in turn necessitated new methods for systematically managing massive XML-based documents. Unlike general documents of planar structure based on lines, documents in XML internally constitute a tree structure. Therefore, traditional version control techniques that recognize documents of planar structure are not suitable in handling hierarchically structured documents. This paper proposes a new way of managing changes made in structured documents. While being a timestamp-based approach, the proposed method has the characteristics of maintaining version stamps for edges, rather than nodes in the tree structure, and only assigning version stamps when they are required.
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