Abstract XQueryP: An XML Application Development Language

The three main parts of a typical business application are storage, logic, and presentation. XML is playing an increasing role in storage (using XML databases) and presentation (using AJAX and similar web technologies). Application logic, however, still relies to a large extent on traditional programming languages such as Java. Operating on XML data with a traditional programming language leads to a serious "impedance mismatch " because the type system of the programming language is not based on XML. This paper explores ways of eliminating this impedance mismatch by extending XQuery, an XML query language, to implement business logic. This approach can potentially support XML-based applications with a unified type system and programming environment. 1