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XML is a markup language same as HTML. XML tag you can define your self for storing data. XML store (describe) data, nothing more (either temporary or permanent). XML was designed for describing well formed data. Also XML have some strict rules. That rules follow every XML document.
HTML and JavaScript are two different things, but they are complimentary. HTML is a markup language designed for defining static web page content. It is what gives a web page its basic structure. JavaScript is a programming language designed for performing dynamic tasks within that page, like animation or a search box. JavaScript is designed to run within the HTML structure of a website and is often used multiple times. If you're writing code, your JavaScript will be more easily accessed if you place them in separate files.