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.

• Validated vs. “well-formed” - separation of authoring process from representation & presentation.

• Either validated in DTD/Schema or well-formed.

• Compatible with relational DBs.

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