Abstract
As secure query processing of XML data stream in ubiquitous environment has become very important, there is an increasing need to enforce efficient secure access control. In this paper we propose a new access control for secure query processing using dynamic XML documents labeling technique and XML fragmentation. In particular, Medical records XML document has the characteristic of an infinite addition in width rather than in depth because of the increment of patients. Our new access control method can fully manage the size of documents that increases to infinity. We show that our approach has little impact on the processing time through experimental evaluation.
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