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The fine-grained access control (FGAC) is important to Web applications. However, it can be circumvented by indirect access such as inferring sensitive data from insensitive data. In the previous FGAC studies, the inference information leakage is not well controlled. In addition, the soundness property, which requires that the results of a query under the FGAC should be the subset of the results of...
We propose a unified multimedia query language called UMQL, based on a semi-structured data model. In contrast to previous multimedia query languages that are either designed only for one particular medium or not powerful enough on multimedia query ability, UMQL is a general and powerful multimedia language which can support effectively queries based on content, structure, spatial relationships and...
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