Basic HTML version of Foils prepared May 19 99

Foil 27 DTD definitions

From An Introduction to XML Basic Information Track Computational Science Course CPS616 -- Spring Semester 1999. by Nancy McCracken,Ozgur Balsoy, Tom Scavo
A DTD allows you to create new tags by writing grammar rules which the tags must obey. The rules specify which tags and attributes are valid and their context.
A DTD element declaration looks like: <!ELEMENT person(name, email*)>
  • ELEMENT is the type
  • person is the element declaration
  • (name,email*) is the element content model
  • name and email are the children of person and define the hierarchy of the document.
  • Note that this is called a grammar rule because it could have been written in BNF: person ::= (name, email*)

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