What does <?xml have to do with it?

[tedd <tedd@xxxxxxxxxxxx>]

Hi gang:

I have a small php routine to provide the user with a style choice. 
The working url is here:

http://php1.net/a1/david/

The simple code that allows style switching follows:

<?php session_start();
$the_style = isset($_SESSION['the_style']) ? $_SESSION['the_style'] : 'style1';

if(isset($_GET['set']))
   {
   $set = $_GET['set'];
   if($set == 'style1')
      {
      $the_style = 'style1.css';
      }
   else
      {
      $the_style = 'style2.css';
      }
   $_SESSION['the_style'] = $the_style;
   }

$the_style = $_SESSION['the_style'];
?>

As you can see, the code works. However, if I add the following line 
IN THE HTML (i.e., after ?>):

<?xml version="1.0" encoding="UTF-8" ?>

I receive a:

Parse error: syntax error, unexpected T_STRING

What's up with that? Apparently the php interpreter is considering 
"<?xml" tag as a php declaration -- how do I turn that off? Or is 
this something else?

Cheers,

tedd

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