XTP (XML Template Pages). At first glance
it looks like a simplified HTML (Hypertext Markup Language), but it is a
type of XML (extensible Markup Language) that can be processed to form
JSP (Java Server Pages) pages, which can then be processed to form Java pages,
which can then be compiled into Servlets. The pages can
contain a mixture of JSP and XSLT (extensible Stylesheet Language Transformations)
commands. The extension is usually *.xtp.