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XML-based applications often blur the borders between Internet-, document- and database technology. This is reflected in the architecture of XML-based information systems. Monolithic systems are superseded by systems composed of lightweight, reuseable Java components which are loosely coupled via standardized interfaces. Using the XQL-processor and the PDOM, XML component systems can easily and transparently be augmented with functionality characteristic for database systems: declarative queries and transaction-safe persistence.
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