.DTD File

File extension dtd is used for SGML (and XML) Document Type Definition files.

SGML is a system for defining markup languages. Authors mark up their documents by representing structural, presentational, and semantic information alongside content.

HTML is one example of a markup language.

MIME types:
application/xml
text/xml

Files with dtd extension can be mainly found as special document source files in the SGML and XML Document Type Definition format.

How to open:

Use any text or XML editor to open and view *.dtd files.

How to convert:

It should be possible to conver *.dtd files to other document formats.