XML,Despite being a programming language in plain text mode, similar to HTML, allows us, unlike the latter, extracting information from a database and present it to the user in a simple way.
Download the Manual and User Guide of XML
XML This manual is intended for those who are getting started in this programming language. However, its extension will allow us to understand in a simple way, since it has multiple instance, much of the basic structures of the language. An XML Reference Manual which should always be a place of consultation.