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XML uses _________ principle to formally describe the data.

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XML uses _________ principle to formally describe the data.

(a) DDL

(b) DTD

(c) DML

(d) None of the mentioned

This question was posed to me in class test.

I'm obligated to ask this question of Markup Languages in section Context Free Grammars and Languages of Automata Theory

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Correct choice is (b) DTD

Explanation: A document type definition (DTD) is a set of markup declarations that define a document type for an SGML-family markup language (SGML, XML, HTML). A Document Type Definition (DTD) defines the legal building blocks of an XML document. It defines the document structure with a list of legal elements and attributes.

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