What is XML?

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• light-weight subset of SGML (ISO/IEC 8879:1986);

• meta-language to described logical structure of document;

• well integrated with the Internet;

• internationalisation built in from the start (document declaration part permits Unicode);

• easy to learn, modify and implement;

• logical relations between elements described in Document Type Definition (DTD);

• documents can be well-formed (no DTD needed, nesting correct).

• documents can be valid (according to a DTD);

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