The National Archives
Search our website
  • Search our website
  • Search our records
Image of software box and CD PRONOM
Welcome (PRONOM  home page) About PRONOM Add an entry
Search Help - opens in a new window Information resources - opens in a new window

*Details: File format summary



Search by keyword Search by file format Search by PUID Search by software Search by vendor Search by lifecycles Search by Migration Pathway

Details for:

Save as... XML | CSV Printer friendly version


Name Extensible Hypertext Markup Language
Version 1.1
Other names XHTML (1.1)
Identifiers MIME:  application/xhtml+xml
PUID:  fmt/103
Classification Text (Mark-up)
Disclosure Full
Description The Extensible Hypertext Markup Language (XHTML) is a reformulation of the Hypertext Markup Language (HTML) as an application of the Extensible Markup Language (XML). This allows for the automated processing of XHTML documents using a standard XML parser. XHTML 1.1 is now recommended by the W3C over HTML for the creation of web pages. The structure and grammar of an XHTML document is defined using a Document Type Definition (DTD). An XHTML document consists of nested elements, each of which may have attributes and content. It begins with an XHTML Document Type declaration, defining the XHTML version and Document Type Definition (DTD) to which it conforms. XHTML documents are typically encoded in UTF-8 or UTF-16.
Orientation Text
Byte order  
Related file formats Has lower priority than Internet Archive (1.0)
Has lower priority than Java Archive Format  
Has lower priority than WARC  
Has lower priority than Internet Archive (1.1)
Has lower priority than Apple iBook format  
Has lower priority than ePub format  
Has lower priority than Apple Safari Webarchive  
Has lower priority than WARC (1.1)
Has lower priority than WARC (1.0)
Has priority over Extensible Markup Language (1.0)
Has priority over Hypertext Markup Language  
Is subsequent version of Extensible Hypertext Markup Language (1.0)
Technical Environment  
Released 31 May 2001
Supported until  
Format Risk  
Developed by World Wide Web Consortium
Supported by None.
Source Digital Preservation Department / The National Archives
Source date 11 Mar 2005
Source description  
Last updated 14 Sep 2018
Top of page Top of page
The National Archives Newsletter Icon

Send me The National Archives’ newsletter

A monthly round-up of news, blogs, offers and events.