# DTBook > Mediated Wiki article. Canonical URL: https://mediated.wiki/source/DTBook > Markdown URL: https://mediated.wiki/source/DTBook.md > Source: https://en.wikipedia.org/wiki/DTBook > Source revision: 1003978778 > License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) **DTBook** (an [acronym](/source/Acronym_and_initialism) for *DAISY Digital Talking Book*) or **DAISY XML** is a [XML](/source/XML)-based [document file format](/source/Document_file_format). It is used in [EPUB](/source/EPUB) 2.0 [e-books](/source/E-book) and [DAISY Digital Talking Book](/source/DAISY_Digital_Talking_Book), as well as other places. Unlike other document file formats such as [ODF](/source/Open_document_format) DTBook puts a strong emphasis on structural encoding, but in comparison to other structural file formats such as [DocBook](/source/DocBook) and [TEI](/source/Text_Encoding_Initiative) it is fairly simple. DTBook was developed by the Daisy Consortium as an [accessible](/source/Accessibility) file format similar to [HTML](/source/HTML), with special regard to the requirements of the [visually impaired](/source/Visual_impairment). Therefore, it puts an emphasis on a clear, precise navigation and the explanation of visual elements. DTBook is further developed by the Daisy Consortium and is defined with a [DTD](/source/Document_Type_Definition) as part of the [NISO](/source/National_Information_Standards_Organization) standard Z39.86-2005 ## NIMAS NIMAS ([National Instructional Materials Accessibility Standard](/source/National_Instructional_Materials_Accessibility_Standard)) – a U.S. standard for electronic books for the visually impaired – defines a subset of DTBook XML elements. NIMAS documents are valid according to the DTBook DTD. ## Example

Hello World

This is an example.

## External links - [DAISY/NISO Standard – Guidelines](http://www.daisy.org/z3986/structure/) - [Theory Behind the DTBook DTD](http://www.daisy.org/publications/docs/theory_dtbook/theory_dtbook.html) --- Adapted from the Wikipedia article [DTBook](https://en.wikipedia.org/wiki/DTBook) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/DTBook?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.