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DTD, aka document type definition, is a grammar language created in 1996.

#429on PLDB 28Years Old

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. Read more on Wikipedia...

Example from Wikipedia:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <!DOCTYPE people_list [ <!ELEMENT people_list (person*)> <!ELEMENT person (name, birthdate?, gender?, socialsecuritynumber?)> <!ELEMENT name (#PCDATA)> <!ELEMENT birthdate (#PCDATA)> <!ELEMENT gender (#PCDATA)> <!ELEMENT socialsecuritynumber (#PCDATA)> ]> <people_list> <person> <name>Fred Bloggs</name> <birthdate>2008-11-27</birthdate> <gender>Male</gender> </person> </people_list>

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