XML (eXtensible Markup Language)

• Like SGML, a Data Description Language (Metalanguage).

• Subset/version of SGML.

• Allows fine-granularity markup of content and structure. Author can create their own elements (extensible).

• Tags define the structure of document not presentation format.

• All XML must have well-formed document structure, but may be validated against a DTD or Schema.

• Compatible with relational DBs.

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