--- /dev/null
+;;; html5-schema.el --- Add HTML5 schemas for use by nXML -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2016 Free Software Foundation, Inc
+
+;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
+;; Keywords: html, xml
+;; Version: 0.1
+;; URL: https://github.com/validator/validator
+;; Package-Type: multi
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; The RelaxNG files are taken straight from
+;; https://github.com/validator/validator.git's via:
+;;
+;; git subtree -P schema/html5 split
+;;
+;; To which we manually add `locating-rules.xml` and this file.
+
+;;; Code:
+
+;;;###autoload
+(when load-file-name
+ (let* ((dir (file-name-directory load-file-name))
+ (file (expand-file-name "locating-rules.xml" dir)))
+ (eval-after-load 'rng-loc
+ `(progn
+ (add-to-list 'rng-schema-locating-files-default 'file)
+ ;; FIXME: We should only push to rng-schema-locating-files-default,
+ ;; since rng-schema-locating-files is a custom var, but by the time
+ ;; we run, rng-schema-locating-files has already been initialized
+ ;; from rng-schema-locating-files-default, so setting
+ ;; rng-schema-locating-files-default doesn't have any effect
+ ;; any more!
+ (add-to-list 'rng-schema-locating-files ,file)
+ (put 'http://whattf.org/datatype-draft 'rng-dt-compile
+ #'nxml-html5-dt-compile)))))
+
+;;;###autoload
+(add-to-list 'auto-mode-alist '("\\.html?\\'" . nxml-mode))
+
+(defvar nxml-html5-dt-params nil)
+(defvar nxml-html5-dt-names nil)
+
+;;;###autoload
+(defun nxml-html5-dt-compile (name params)
+ ;; FIXME: How/when is `params' ever used? It seems to always be nil!
+ (add-to-list 'nxml-html5-dt-params params)
+ (add-to-list 'nxml-html5-dt-names name)
+ ;; FIXME: We currently don't do any actual validation of datatypes!
+ '(t identity))
+
+(provide 'html5-schema)
+;;; html5-schema.el ends here
--- /dev/null
+<!-- <?xml version="1.0"?> -->
+<locatingRules xmlns="http://thaiopensource.com/ns/locating-rules/1.0">
+ <uri pattern="*.html" typeId="HTML5" />
+ <uri pattern="*.xhtml" typeId="XHTML5" />
+ <namespace ns="http://www.w3.org/1999/xhtml" typeId="XHTML5"/>
+ <documentElement localName="html" typeId="HTML5" />
+ <typeId id="XHTML5" uri="xhtml5.rnc" />
+ <typeId id="HTML5" uri="html5.rnc" />
+</locatingRules>