The Content-type HTTP header and/or meta element are what browsers use to
determine if a document is interpreted as HTML, XHTML, or something else. For
various reasons (mainly IE 6, 7, 8, and 9), I wouldn't recommend serving XHTML
(application/xhtml+xml) to web browsers. I don't see any advantages to it and I
think it introduces significant risk. The DOM and CSS selectors are slightly
different with XML compared to HTML served as text/html. For example, I'm not
sure any of the popular JavaScript frameworks explicitly supports running as
XHTML. In more of a web service scenario, where the client is known to accept
XHTML, I’d recommend using application /xhtml+xml. However, that’s not the case
for today’s browsers.
Irrespective of the root element namespace or the DOCTYPE, I would recommend
serving pages that you intend to be consumed by today's browsers as
"text/html". The DOCTYPE, on the other hand, is what browsers use to toggle
between rendering modes--the older "quirks" mode for backward compatibility and
the new standards mode. This affects the HTML DOM in JavaScript as well as
various CSS properties. I would strongly recommend always using a DOCTYPE to
trigger standards mode. The actual contents of DOCTYPE declaration is
meaningless; the fact that it's there is what triggers standards mode. (For
example, HTML5 recommends the DOCTYPE, <!DOCTYPE html>.) As Geert has pointed
out below, there are special things that the serializer does in the name of
pragmatism for properly namespaced XHTML.
Here's the template that I typically use:
(
xdmp:set-response-content-type('text/html;charset=utf-8'),
'<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>',
<html xmlns="http://www.w3.org/1999/xhtml";>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<title>Welcome to MarkLogic Server</title>
...
</head>
...
</html>
)
Justin
Justin Makeig
Product Manager
Mark Logic Corporation
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Suite 200
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[email protected]<mailto:[email protected]>
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-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Geert Josten
Sent: Friday, September 11, 2009 5:33 AM
To: General Mark Logic Developer Discussion
Subject: RE: [MarkLogic Dev General] Marklogic formatting of empty XHTMLelements
> > The serializer won't collapse empty div, script, and
> textarea elements if they're in the XHTML namespace.
> > Hopefully this helps. Please let me know if you have
> further questions or concerns.
>
> Is that enough? I know that in the past, I've had trouble
> with empty <em/> tags being misinterpreted by browsers.
It looks like it works for any empty element in that namespace:
<x />,
<x xmlns="http://www.w3.org/1999/xhtml"; />
==>
<x/>
<x xmlns="http://www.w3.org/1999/xhtml";></x>
The problem is actually that we tend to set the response type to 'text/html',
while we are actually outputting XHTML. The HTML standard doesn't allow this />
shortened notation of empty elements and browsers tend to ignore the / in them,
thinking it is actually a start tag instead of an empty tag.
The alternative might be to set the response content-type to
'application/xhtml+xml', but you never know what kind of browser (version)
someone is using. I think this is the safest approach..
Kind regards,
Geert
Drs. G.P.H. Josten
Consultant
http://www.daidalos.nl/
Daidalos BV
Source of Innovation
Hoekeindsehof 1-4
2665 JZ Bleiswijk
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