XRX Using XPath 2.0 is centered around the idea that knowledge of XPath 2.0 and XML is a valuable tool for programming both the client side and the server side when you work on a pure XML platform. XRX stands for XForms + REST + XQuery, which are defined as follows: XForms is a technique for displaying forms based on XML documents using XPath queries instead of JavaScript code. REST is an architectural style for creating services using simple time-proven web mechanisms. XQuery is a language for accessing databases, both native XML and relational, using pure XML logic centered around XPath. The XRX architecture fits in the current trends on the Internet: Richer clients (Flex, Silverlight, Java FX, JSF, Google Web Toolkit) Simpler, stateless services The rise of pure XML access to databases since XQuery 1.0 became an official recommendation The use of REST in the middle allows developers to use clients other than XForms or servers other than XQuery. The pure XML combination of XRX is the most efficient combination, however . What you'll learn Create richer clients more easily. Work on a pure XML platform. Create RESTful web applications. Who is this book for? Java developers looking for new ways to develop software. Such developers may know some XML but is not yet familiar with all the fine details. XML developers who know the older versions of technologies like XPath 1.0, but not the newest versions.