.DTD File Extension
File Type 1Document Type Definition File
Text file that specifies elements and attributes used in an XML, SGML, HTML, or XHTML document; can also define the ordering and nesting for elements and their attributes; commonly referenced within Web pages 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.
File Type 2Design Tools Draw File
This file is saved in a binary format, which requires a specific program to read its contents.
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.