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We present a new approach for concurrency control over XML documents. Unlike most of other approaches, we use an optimistic scheme, since we believe that it is better suited for Web applications. The originality of our solution resides in the fact that we use path expressions associated with operations to detect conflicts between transactions. This makes our approach scalable since conflict detection except in few cases does not depend on the database size nor on the amount of modifieddoi:10.1145/1456223.1456303 dblp:conf/wstst/BerrabahGCP08 fatcat:tdgfmdiozvh3thtozurief66k4