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We propose an efficient caching mechanism for XML content adaptation. Our adaptation framework consists of two modules. One module generates transformation rules and the other transforms source XML contents using the transformation rules. Unlike conventional caching mechanisms that store transformed contents, our mechanism stores the transformation rules between two modules. We show its performance improvement in terms of measured hit ratio and space efficiency in a comparison with conventional mechanisms.1 resource: data, service or system component subject: an actor action: an operation on a resource

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Environmentally-adaptive XML transformation is a key goal for content adaptation. It needs a standard and computationally efficient framework for transformation engine than can transform input XML data depending on environment descriptions (e.g., terminal capabilities) and rule descriptions (e.g., access policies). We propose a method to realize the framework. We adopt XSLT and DOM processors: the DOM processors use environment descriptions and rule descriptions in composing XSLT instances; the XSLT processors refer to the XSLT instances in transforming the input XML data. We cache the XSLT instances for reuse. Since one XSLT instance is produced for each environment description, their number is manageable; XSLT instances are not necessarily created for every input. Caching the XSLT instances and reducing the number of XSLT instances created yields a significant computational advantage in large-scale multimedia content delivery. We will use the proposed framework to create an AAA (Authentication, Authorization, and Accounting) system for multimedia content delivery and network control.