From mboxrd@z Thu Jan  1 00:00:00 1970
Path: news.gmane.org!.POSTED!not-for-mail
From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.help
Subject: Re: Basic question on choosing nxml-mode schema
Date: Thu, 10 Nov 2016 12:05:46 -0500
Message-ID: <jwv4m3fguha.fsf-monnier+Inbox@gnu.org>
References: <1447994335.988177.1478636797036.ref@mail.yahoo.com>
	<1447994335.988177.1478636797036@mail.yahoo.com>
	<20161109090638.GF17359@tuxteam.de>
	<CAP_d_8VOZ_GPzDhHxh41ZeO6hFFD7XcKBp1ZDKuL+ROzvvyjrQ@mail.gmail.com>
	<jwvzil8o2bb.fsf-monnier+gmane.emacs.help@gnu.org>
	<1772356535.1551835.1478788667810@mail.yahoo.com>
NNTP-Posting-Host: blaine.gmane.org
Mime-Version: 1.0
Content-Type: text/plain
X-Trace: blaine.gmane.org 1478800634 30385 195.159.176.226 (10 Nov 2016 17:57:14 GMT)
X-Complaints-To: usenet@blaine.gmane.org
NNTP-Posting-Date: Thu, 10 Nov 2016 17:57:14 +0000 (UTC)
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)
Cc: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
To: "Dr. Jennifer Nussbaum" <bg271828@yahoo.com>
Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Thu Nov 10 18:57:09 2016
Return-path: <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>
Envelope-to: geh-help-gnu-emacs@m.gmane.org
Original-Received: from lists.gnu.org ([208.118.235.17])
	by blaine.gmane.org with esmtp (Exim 4.84_2)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>)
	id 1c4taj-000504-TF
	for geh-help-gnu-emacs@m.gmane.org; Thu, 10 Nov 2016 18:56:50 +0100
Original-Received: from localhost ([::1]:48169 helo=lists.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>)
	id 1c4tam-0007l0-Up
	for geh-help-gnu-emacs@m.gmane.org; Thu, 10 Nov 2016 12:56:52 -0500
Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:50121)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <monnier@iro.umontreal.ca>) id 1c4snP-0007PI-U0
	for help-gnu-emacs@gnu.org; Thu, 10 Nov 2016 12:05:52 -0500
Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <monnier@iro.umontreal.ca>) id 1c4snM-0000U4-LC
	for help-gnu-emacs@gnu.org; Thu, 10 Nov 2016 12:05:51 -0500
Original-Received: from chene.dit.umontreal.ca ([132.204.246.20]:32978)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <monnier@iro.umontreal.ca>) id 1c4snM-0000T6-FI
	for help-gnu-emacs@gnu.org; Thu, 10 Nov 2016 12:05:48 -0500
Original-Received: from pastel.home (lechon.iro.umontreal.ca [132.204.27.242])
	by chene.dit.umontreal.ca (8.14.7/8.14.1) with ESMTP id uAAH5kKs011478; 
	Thu, 10 Nov 2016 12:05:47 -0500
Original-Received: by pastel.home (Postfix, from userid 20848)
	id C65E0601A5; Thu, 10 Nov 2016 12:05:46 -0500 (EST)
In-Reply-To: <1772356535.1551835.1478788667810@mail.yahoo.com> (Jennifer
	Nussbaum's message of "Thu, 10 Nov 2016 14:37:47 +0000 (UTC)")
X-NAI-Spam-Flag: NO
X-NAI-Spam-Level: 
X-NAI-Spam-Threshold: 5
X-NAI-Spam-Score: 0.2
X-NAI-Spam-Rules: 3 Rules triggered
	TRK_NCM1=0.2, EDT_SA_DN_PASS=0, RV5854=0
X-NAI-Spam-Version: 2.3.0.9418 : core <5854> : inlines <5443> : streams
	<1719847> : uri <2324085>
X-detected-operating-system: by eggs.gnu.org: Genre and OS details not
	recognized.
X-Received-From: 132.204.246.20
X-BeenThere: help-gnu-emacs@gnu.org
X-Mailman-Version: 2.1.21
Precedence: list
List-Id: Users list for the GNU Emacs text editor <help-gnu-emacs.gnu.org>
List-Unsubscribe: <https://lists.gnu.org/mailman/options/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/archive/html/help-gnu-emacs/>
List-Post: <mailto:help-gnu-emacs@gnu.org>
List-Help: <mailto:help-gnu-emacs-request@gnu.org?subject=help>
List-Subscribe: <https://lists.gnu.org/mailman/listinfo/help-gnu-emacs>,
	<mailto:help-gnu-emacs-request@gnu.org?subject=subscribe>
Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org
Original-Sender: "help-gnu-emacs"
	<help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org>
Xref: news.gmane.org gmane.emacs.help:111706
Archived-At: <http://permalink.gmane.org/gmane.emacs.help/111706>

> gives me only two problems: this rejects 'lang="EN"' with "Attribute
> not allowed"; and it rejects <style> as "Element not allowed in this
> context", even when appearing within a <body> area.

I'm not very knowledgeable in XML/SGML/HTML, but I do know that HTML5
has a much tougher stance on what is allowed where, to try and help
enforce a clean separation between content (in HTML) and presentation
(in CSS).

So maybe these are bugs in html5-schema or in nxml-mode, but my gut
feeling is that it might simply be because these constructs are not
allowed in HTML5 any more.

[ Reaches for his web browser... ]
Hmm... apparently the "lang" attribute should be allowed anywhere in
HTML5, so this looks like a bug in html5-schema.

But w.r.t the `style` tag, I see:

    Note: If the "scoped" attribute is not used, each <style> tag must
    be located in the head section.

so nXml is probably right to signal an error when it sees a `style` in
the body.

> <!doctype html>
> <html lang="en">

My memory is fuzzy, but isn't XML case-sensitive (in contrast to SGML?).
So I think you want

    <!DOCTYPE html>
    <html lang="en">

I usually start my documents with

    <?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE html>
    <html xmlns="http://www.w3.org/1999/xhtml">

IIRC some of those lines are redundant but server to make the document
valid both as HTML and as XML.

> then it rejects "doctype" with "Unknown markup declaration", the
> "lang" as above, "Referenced entity has not been defined" for &ndash;
> and related, and <style> as above.

W.r.t &ndash, I recommend you use an actual ndash character rather than
an entity reference.  XML is supposed to readable/parseable without
knowing the document type and schema, so the only entities you can
reliably use are those few entities that are valid in all document
types, i.e. &amp;, &lt; &quot; &apos; and &gt;.
To make up for that restriction, you get to use the full Unicode set
of characters.


        Stefan