What is DTD? What Opens a DTD? File Format List from WhatIs.com

File Extension

DTD File Format

|SGML Document Type Definition (DTD) file

DTD file format icon

DTD is a file extension for a Document Type Definition (DTD) file format used in SGML, XML, HTML or XHTML to identify what the variables (or markup) are that format a document. In the case of a text document, for example, markup would specify separating paragraphs, identifying topic headings, and so forth and how each is to be processed.

MIME type: application/xml


Learn more about DTD files:

What is the intent of the DTD? Expert response from Sean McGrath at Search SOA.

Search for answers to DTD-related questions at IT Knowledge Exchange.

This was last updated in August 2010
Editorial Director Margaret Rouse

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