trouble getting declared namespaces to work

I am trying to get namespaces written in an external css (two separate files actually). When I run the file on my browser it will not use the declared namespaces. I think that the file is calling the css file but its not applying the namespaced style

HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<?xml version="1.0" encoding="utf-8"?>


<html xmlns:act="http://www.superstarmovies.com/actors" 
  xmlns:mov="http://www.superstarmovies.com/movies"
  xmlns="http://www.w3.org/1999/xhtml" >

<head>
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=utf-8" />
<title>Superstar Movies: Stars of the Month</title>
<link rel="stylesheet" href="movies.css"  type="text/css" ?>
<link rel="stylesheet" href="actors.css" type="text/css" ?>
<link rel="stylesheet" href="superstar.css" type="text/css" />
</head>

<body>
<div id="heading"><img src="logo.gif" alt="Superstar Movies" /></div>

<div id="main">
<h1>Stars of the Month</h1>
<h3>Movies by Our Featured Stars!</h3>
<act:actors>

    <act:actor>
        <act:name>Halle Berry</act:name>
    <act:date>August 14, 1966</act:date>
    <act:birthplace>Cleveland, Ohio</act:birthplace>
          <mov:movie genre="action" star="Halle Berry">
        <mov:name>Catwoman</mov:name>
    <mov:date>(2004)</mov:date>
    <mov:length>104 minutes</mov:length>
    </mov:movie>

    <mov:movie genre="horror" star="Halle Berry">
        <mov:name>Gothika</mov:name>
    <mov:date>(2003)</mov:date>
    <mov:length>98 minutes</mov:length>
    </mov:movie>

    <mov:movie genre="drama" star="Halle Berry">
        <mov:name>Monster&apos;s Ball</mov:name>
    <mov:date>(2001)</mov:date>
    <mov:length>111 minutes</mov:length>
    </mov:movie>

    <mov:movie genre="fantasy" star="Halle Berry">
        <mov:name>X-Men</mov:name>
    <mov:date>(2000)</mov:date>
    <mov:length>104 minutes</mov:length>
    </mov:movie>

    <mov:movie genre="romance" star="Halle Berry">
        <mov:name>Jungle Fever</mov:name>
    <mov:date>(1991)</mov:date>
    <mov:length>132 minutes</mov:length>
    </mov:movie>
    </act:actor>

    <act:actor>
    <act:name>Tom Hanks</act:name>
    <act:date>July 9, 1956</act:date>
    <act:birthplace>Concord, California</act:birthplace>

<mov:movie genre="drama" star="Tom Hanks">
    <mov:name>Catch Me If You Can</mov:name>
<mov:date>(2002)</mov:date>
<mov:length>141 minutes</mov:length>
</mov:movie>

<mov:movie genre="adventure" star="Tom Hanks">
    <mov:name>Cast Away</mov:name>
<mov:date>(2000)</mov:date>
<mov:length>143 minutes</mov:length>
</mov:movie>

<mov:movie genre="action" star="Tom Hanks">
    <mov:name>Saving Private Ryan</mov:name>
<mov:date>(1998)</mov:date>
<mov:length>170 minutes</mov:length>
</mov:movie>

<mov:movie genre="adventure" star="Tom Hanks">
    <mov:name>Apollo 13</mov:name>
<mov:date>(1995)</mov:date>
<mov:length>140 minutes</mov:length>
</mov:movie>

<mov:movie genre="comedy" star="Tom Hanks">
    <mov:name>Forrest Gump</mov:name>
<mov:date>(1994)</mov:date>
<mov:length>142 minutes</mov:length>
</mov:movie>

<mov:movie genre="drama" star="Tom Hanks">
    <mov:name>Philadelphia</mov:name>
<mov:date>(1993)</mov:date>
<mov:length>125 minutes</mov:length>
</mov:movie>

<mov:movie genre="comedy" star="Tom Hanks">
    <mov:name>Big</mov:name>
<mov:date>(1988)</mov:date>
<mov:length>104 minutes</mov:length>
</mov:movie>
    </act:actor>

</act:actors>
</div>

 <address>
Superstar Movies &#183; 123 Moviestar Lane &#183; Hollywood, FL 12345
</address>

</body>

</html>

CSS

 @namespace act "http://www.superstarmovies.com/actors";

act|actor        {display: block; font-family: Arial, Helvetica, sans-serif;
          margin-bottom: 20pt}

act|name, act|date   {display: block}

act|name         {font-size: 14pt; color: DarkRed; font-style: bold}

act|date, act|birthplace   {display: inline; font-style: italic; color: DarkRed}

act|birthplace         {padding-left: 0.5em}

@namespace mov "http://www.superstarmovies.com/movies";

mov|movie        {display:block; font-family: Arial, Helvetica, sans-serif}

mov|name, mov|date, mov|length  {display: inline}

mov|name         {font-style: bold; color:#003;}

mov|length       {font-style: italics; padding-left: 0.5em}

Thoughts?

BoltClock

In your XHTML:

Your markup is not well-formed:

Your XML declaration should come first, then your doctype declaration:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

Some of your <link /> tags aren't closed properly, they should be:

<link rel="stylesheet" href="movies.css"  type="text/css" />
<link rel="stylesheet" href="actors.css" type="text/css" />

Your page must be served as application/xhtml+xml by the server. Typical servers don't know that you're serving XHTML, so they send them as text/html instead. Browsers won't be able to treat text/html files as XML, so they won't apply CSS to your custom XML elements.

If you work with PHP, it's simply a matter of adding this to the very top of your XHTML file:
```
<?php header('Content-Type: application/xhtml+xml'); ?>
```
Or in ASP, add this:
```
<% Response.ContentType = "application/xhtml+xml"; %>
```
You should also have an accompanying meta tag, but it's not necessary for your page to validate, and browsers ignore it anyway:
```
<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=utf-8" />
```
You can find a short history lesson on UAs treating XHTML as HTML tag soup in this answer to better understand this.

In your CSS:

It's font-weight: bold, not font-style: bold.
It's font-style: italic, not font-style: italics.
Make sure that your @namespace statements are placed at the beginning of your stylesheets. From the spec:

Any @namespace rules must follow all @charset and @import rules and precede all other non-ignored at-rules and rule sets in a style sheet.

But with all that said, why aren't you placing your actors and movies into their own XML files, then transforming them using XSLT into familiar, actual XHTML?

来源：https://stackoverflow.com/questions/9490155/trouble-getting-declared-namespaces-to-work

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html

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xml

xhtml

xml-namespaces