XML (eXtensible Markup Language) is a flexible way to create common information formats and share both the format and the data on the Web, on intranets, and elsewhere. XML documents are made up of storage units called entities, which contain either parsed or unparsed data. Parsed data are made up of characters, some of which form character data, and some of which form markup, which encodes a description of the document’s storage layout and logical structure. XML provides a mechanism to impose constraints on the storage layout and logical structure.
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