Some problem in using SMIL2.0 Linking Modules/ a Element/ target attribute

I just visited the www.w3.org, in the webpage 
http://www.w3.org/TR/2005/REC-SMIL2-20050107/extended-linking.html#adef-target

There is statement like this 

Example 1

This examples shows the use of the target and accesskey attributes. The
upper half of the display shows an image. If the user clicks on the image, a
SMIL presentation is played in the lower half of the display. The same thing
happens if the user hits the 'a' key.

<smil xmlns="http://www.w3.org/2001/SMIL20/Language">
  <head>
    <layout>
      <region id="source"      height="50%"/>
      <region id="destination" top   ="50%"/>
    </layout>
 </head>
 <body>
    xxx 
      source.jpg 
    
 </body>
</smil>

I have tried this attribute in my own SMIL file, and found it doesn't work. 
I am using RealPlayer V10.5 to running SMIL file. 

Can some one tell me why I can't use this attribute even the file is from
w3.org?

<here, xxx can be smil file, or img, or video>


Thank you very much!
-- 
View this message in context: http://www.nabble.com/Some-problem-in-using-SMIL2.0-Linking-Modules--a-Element--target-attribute-tf4867118.html#a13928038
Sent from the w3.org - www-smil mailing list archive at Nabble.com.

Received on Sunday, 25 November 2007 00:25:25 UTC