W eb pages use HTML to indicate formatting to a browser. The web has become very popular in part because HTML is relatively simple and easy to use. But HTML focuses on presentation, making it hard to determine the information on a page. XML (Extensible Markup Language) lets us devise our own tags to reflect the information content. We can pass these standard XML files among various applications to transfer information from one program to another.
Learn XML syntax
Use a schema to specify a valid ...