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A New Way of Generating Reusable Index Labels for Dynamic XML

XML now becomes a standard for the various businesses in the world. Manipulation of the data and evaluating the queries over the data in the XML documents is very important. The indexing schemes use various labeling schemes for the static and dynamic XML document. The performance of the query system depends on the way of getting the data from the document. The persistent labels assigned to the node will help to get the structural information like ancestor-descendant relationship among the nodes of the XML data while querying. In the case of dynamic XML, the document allows the operations like inserting, deleting and updating nodes in the XML document. Particularly for the frequently changed documents, the labels assigned to the nodes will be affected. Most of the existing labeling schemes require the re-computation while changes take place. The proposed system NSAX( New Scheme for Accessing XML) will avoids this problem and also provides the way of using the deleted labels. Moreover, the system provides a way of authentication to the documents. The access control label is assigned to the nodes such that it describes the roles that can access the nodes as well as the level of the nodes in which the nodes present in the document. The experimental results show that the improvement in the performance of the system. Keywords— access control, dynamic XML, persistent labeling, querying, re-computation.