Notes                               for more details  dataset reference

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A <dataset> can also point to a server-side program (in this example, a JSP) that generates the XML document dynamically. This is the most popular approach to develop applications that use dynamic data coming from a database or any other datasource. In this example, a JSP (JavaServer Page) is used to retrieve data from a relational database and format the result set as an XML document. A dataset can point to any kind of server-side program that is capable of generating XML dynamically: JavaServer Pages, Servlets, Microsoft Active Server Pages, ColdFusion pages, CGI applications, PHP scripts, etc.