• A markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The design goals of XML emphasize simplicity, generality, and usability across the Internet. Although the design of XML focuses on documents, the language is widely used for the representation of arbitrary data structures such as those used in web services. XML was first defined in 1998. ← Wikipedia ↑ w3.org/XML

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