Document Type Definition

The Document Type Definition (DTD), like the XML Schema, is a set of rules used to describe elements and attributes in an XML document. As a means of validation, the DTD originated in SGML. Because the DTD uses a syntax different from XML and has limitations in functionality, the XML Schema has begun to replace it.

A DTD can be included in an XML file, or can be a separate file referenced by an XML file.



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