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	Short for document type definition. 
	The purpose of a Document Type Definition is to define the legal building blocks of an XML document. It defines the document structure with a list of legal elements.
	
  
	In this website a reference in each webpage is made to the DTD, to which the XHTML markup should conform.
	
  
	The successor of the DTD is the XML based alternative XSD.
	
	
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