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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.
There are two primary parts to XHTML: HTML 4. HTML 4 is a markup language used for displaying text and documents across different platforms and machines. It was originally intended for a very specific audience, and has expanded to include hypertext, multimedia, as well as the style of the documents displayed. XML.