.DTD File Extension
File Type 1Document Type Definition File
What is a DTD file?
A DTD file is a text file that specifies elements and attributes used in an XML, SGML, HTML, or XHTML document. It can also define the ordering and nesting for elements and their attributes. DTD files are commonly referenced within webpages using a URL.
DTD files are also used to validate whether a file represents a valid document. For example, before parsing an XML file, a program may first validate the markup declarations using a DTD file to make sure that the XML can be parsed properly.
Programs that open DTD files
File Type 2Design Tools Draw File
.DTD File Association 2
Drawing created by 2D Design, a program used for creating two-dimensional designs; may contain lines, shapes, colors, and other drawing elements; may be resized without losing image quality; used for various types of drawings, including buildings, vehicles, machines, and logos.