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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.
In practise, very few XHTML documents are served over the Web with the correct MIME media type, application/xhtml+xml. Whilst authored to the stricter rules of XML, they are sent with the media type for HTML (text/html). The receiving browser considers the content to be HTML, and does not utilise its XML parser.