XML can be used to exchange, share, and store data.
XML documents form a tree structure that starts at "the root" and branches to "the leaves".
XML has very simple syntax rules. XML with correct syntax is "Well Formed". Valid XML also validates against a DTD (Document Type Definition).
All modern browsers have a built-in XML parser that can read and manipulate XML.
XSLT (XML Stylesheet Language Transformations) is used to transform XML into other formats like HTML.
The XMLHttpRequest object provides a way to communicate with a server after a web page has loaded.
The DOM (Document Object Model) defines a standard way for accessing XML.
Text inside a CDATA [(Unparsed) Character Data] section is ignored by the parser.
XML Namespaces provide a method to avoid element name conflicts.
You may read more articles about XML here
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