{
 "id": "extensible-hypertext-markup-language-1-0",
 "name": "Extensible Hypertext Markup Language",
 "version": "1.0",
 "aliases": [
  "XHTML (1.0)"
 ],
 "category": "markup",
 "identifiers": {
  "extensions": [
   "html",
   "htm",
   "xhtml"
  ],
  "mime": [
   "application/xhtml+xml"
  ],
  "puid": [
   "fmt/102"
  ],
  "signatures": [
   {
    "name": "XHTML 1.0",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "max_offset": 1024,
      "pattern": "3c21444f43545950452068746d6c205055424c494320222d2f2f5733432f2f445444205848544d4c20312e30"
     },
     {
      "position": "var",
      "pattern": "3c68746d6c20786d6c6e733d22687474703a2f2f7777772e77332e6f72672f313939392f7868746d6c22*3c7469746c653e*3c2f7469746c653e"
     }
    ]
   }
  ],
  "priority_over": [
   "fmt/101",
   "fmt/96"
  ]
 },
 "status": "unknown",
 "summary": "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 1.0 represents the reformulation of HTML 4.01 in XML. 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.",
 "projects": [
  {
   "name": "PRONOM fmt/102",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/fmt/102",
   "kind": "format-doc"
  }
 ],
 "provenance": {
  "sources": [
   "pronom"
  ]
 },
 "updated": "2026-06-09",
 "family": "html",
 "tools": [
  {
   "name": "AbiWord",
   "url": "https://www.wikidata.org/wiki/Q136775",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License, version 2.0 or later",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "Amira",
   "url": "http://www.amira.com",
   "reads": true,
   "writes": false,
   "via": "html"
  },
  {
   "name": "CitizenGuide.KE",
   "url": "https://www.citizenguide.ke/",
   "reads": true,
   "writes": false,
   "license": "Creative Commons Attribution 4.0 International",
   "via": "html"
  },
  {
   "name": "Cybook Opus",
   "url": "https://www.wikidata.org/wiki/Q4992154",
   "reads": true,
   "writes": false,
   "via": "html"
  },
  {
   "name": "DatabaseSpy",
   "url": "http://www.altova.com/databasespy.html",
   "reads": false,
   "writes": true,
   "license": "end-user license agreement",
   "via": "html"
  },
  {
   "name": "DataGrip",
   "url": "https://www.jetbrains.com/datagrip/",
   "reads": false,
   "writes": true,
   "via": "html"
  },
  {
   "name": "Deark",
   "url": "https://entropymine.com/deark/",
   "reads": false,
   "writes": true,
   "license": "MIT License",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "djot.js",
   "url": "https://www.wikidata.org/wiki/Q116355874",
   "reads": false,
   "writes": true,
   "license": "MIT License",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "djot.lua",
   "url": "https://www.wikidata.org/wiki/Q116355766",
   "reads": false,
   "writes": true,
   "license": "MIT License",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "DynaWeb",
   "url": "https://www.wikidata.org/wiki/Q124454432",
   "reads": false,
   "writes": true,
   "via": "html"
  },
  {
   "name": "FlexPro",
   "url": "http://www.weisang.com/",
   "reads": true,
   "writes": false,
   "license": "proprietary license",
   "via": "html"
  },
  {
   "name": "GNOME Help",
   "url": "https://wiki.gnome.org/Apps/Yelp",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License, version 2.0 or later",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "GNU UnRTF",
   "url": "https://www.gnu.org/software/unrtf/",
   "reads": false,
   "writes": true,
   "via": "html"
  },
  {
   "name": "Google Docs",
   "url": "https://www.google.com/docs/about",
   "reads": true,
   "writes": true,
   "via": "html"
  },
  {
   "name": "Google Docs",
   "url": "https://www.docs.google.com/",
   "reads": true,
   "writes": true,
   "license": "proprietary license",
   "via": "html"
  },
  {
   "name": "htmlq",
   "url": "https://www.wikidata.org/wiki/Q135992081",
   "reads": true,
   "writes": false,
   "license": "MIT License",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "Kobo eReader",
   "url": "http://www.koboereader.com/",
   "reads": true,
   "writes": false,
   "via": "html"
  },
  {
   "name": "Mathematica",
   "url": "https://www.wolfram.com/mathematica/",
   "reads": true,
   "writes": true,
   "license": "proprietary license",
   "via": "html"
  },
  {
   "name": "MuPDF",
   "url": "https://mupdf.com/",
   "reads": false,
   "writes": true,
   "license": "GNU Affero General Public License, version 3.0 or later",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "Navicat",
   "url": "http://www.navicat.com/",
   "reads": true,
   "writes": true,
   "via": "html"
  },
  {
   "name": "Netscape 1.0",
   "url": "https://www.wikidata.org/wiki/Q33129612",
   "reads": false,
   "writes": true,
   "via": "html"
  },
  {
   "name": "Onyx Boox",
   "url": "https://euroshop.boox.com/",
   "reads": true,
   "writes": false,
   "via": "html"
  },
  {
   "name": "Orbada",
   "url": "http://orbada.sourceforge.net",
   "reads": false,
   "writes": true,
   "license": "GNU General Public License",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "Oxygen XML Editor",
   "url": "https://www.oxygenxml.com/",
   "reads": true,
   "writes": true,
   "license": "proprietary license",
   "via": "html"
  },
  {
   "name": "Pandoc",
   "url": "https://pandoc.org/",
   "reads": true,
   "writes": true,
   "license": "GNU General Public License, version 2.0",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "PDF Guru",
   "url": "https://pdfguru.com/",
   "reads": true,
   "writes": false,
   "via": "html"
  },
  {
   "name": "Q1047199",
   "url": "https://imagemagick.org",
   "reads": true,
   "writes": false,
   "license": "ImageMagick License",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "Q207902",
   "url": "https://www.adobe.com/it/acrobat.html",
   "reads": false,
   "writes": true,
   "license": "proprietary license",
   "via": "html"
  },
  {
   "name": "Q220993",
   "url": "https://www.gnumeric.org/",
   "reads": true,
   "writes": true,
   "license": "GNU General Public License, version 2.0 / GNU General Public License, version 3.0",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "Q747793",
   "url": "https://calibre-ebook.com",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License, version 3.0",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "SQL Database Studio",
   "url": "https://sqldatabasestudio.com/",
   "reads": false,
   "writes": true,
   "license": "Common Public License",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "StarOffice 5.2",
   "url": "https://www.wikidata.org/wiki/Q63646514",
   "reads": false,
   "writes": true,
   "via": "html"
  },
  {
   "name": "Stratify",
   "url": "http://www.stratify.org",
   "reads": false,
   "writes": true,
   "via": "html"
  },
  {
   "name": "Supermium",
   "url": "https://win32subsystem.live/supermium/",
   "reads": true,
   "writes": false,
   "license": "3-clause BSD License",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "uMap",
   "url": "https://umap.openstreetmap.fr/",
   "reads": false,
   "writes": true,
   "license": "WTFPL",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "vimwiki",
   "url": "http://vimwiki.github.io/",
   "reads": false,
   "writes": true,
   "license": "MIT License",
   "open_source": true,
   "via": "html"
  },
  {
   "name": "WinhelpCGI",
   "url": "https://www.herdsoft.com/linux/produkte/winhelpcgi.html",
   "reads": false,
   "writes": true,
   "license": "GNU General Public License, version 2.0",
   "open_source": true,
   "via": "html"
  }
 ],
 "parsers": [],
 "conversions": []
}