Abstract
The increasing number of XML repositories has stimulated the design of systems that can store and query XML data efficiently. OrientX, a native XML database system, is designed to meet this requirement. Compared with other native XML databases, OrientX has two main features: First, XML schema is fully supported in OrientX, because schema has been proved to be of great importance to XML data storage, Indexing, query optimization and access control; Second, OrientX is an integrated system that meets various requirements on XML data repository, which includes a native storage subsystem, several XML query evaluators, a composite index manager, a cost-based XQuery Optimizer, an Access Control module and an extension to XQuery1.0 for XML update. The main contributions of OrientX are: a)We have implemented an integrated native XML database system, which supports native storage of XML data, and based on it we can handle XPath& XQuery efficiently; b)In our OrientX system, Schema Information is fully explored to guide the storage, optimization and query processing, which we show can boost the system performance remarkably.
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