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Document type definition. 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 DTD defines the legal building blocks of an XML document. It defines the documentstructure with a list of legal elements and attributes
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)