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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.
Stands for Extensible Hypertext Markup Language.. Yes, apparently Extensible starts with an X.. XHTML is a spinoff of the hypertext markup language (HTML) used for creating Web pages. It is based on the HTML 4.0 syntax, but has been modified to follow the guidelines of XML, the Extensible Markup Language. Therefore, XHTML 1.0 is sometimes referred to as HTML 5.0.