Xml Schema-based Triggers

XML (Extensible Markup Language) has recently emerged as a new standard for data representation and exchange on the Internet. It is expected that XML will become a universal format for data exchange on the Web. There is a need for an efficient XML database system that can be used to manipulate and process XML data. Trigger mechanism is a mature technique in Active Database Systems for providing active functions. Hence, incorporating triggers into an XML database can help users to perform many tasks automatically when they manage and exchange XML data. We propose a Schema-Based XML Trigger Definition. A method to analyze Mutual Triggering and Activation among a set of triggers is provided, in order to determine whether a trigger will terminate or not. This approach provides a way to define XML triggers through XML Schema in order to realize various active functions in XML database. The proposal augments XML Schema into a complete database schema language that integrates the descriptions and definitions of XML databases.