XML: Extensible Markup Language

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The Extensible Markup Language is a strict serialization of the Document Object Model.

XML Index
XML introduction
XML (Extensible Markup Language) is a markup language similar to HTML, but without predefined tags to use. Instead, you define your own tags designed specifically for your needs. This is a powerful way to store data in a format that can be stored, searched, and shared. Most importantly, since the fundamental format of XML is standardized, if you share or transmit XML across systems or platforms, either locally or over the internet, the recipient can still parse the data due to the standardized XML syntax.
xml:base is like the HTML base element, but can specify the base URI per element as well as the entire document.