Description:
------------
We would like to manipulate and genere HTML5 microformat.

Parsing a HTML5 microformat with simpleXML is not possible : Some warning are 
generated and simplexml_load_string function return false.

The problem is with the itemscope attribute : It has no value.

Our XML is available on this web site : http://schema.org/Person

Can you add these manipulations in simpleXML API ?
 * add attribut without value
 * parsing XML with attribute without value.

Thanks.

Test script:
---------------
<?php
$xml = <<<XML
<div itemscope itemtype="http://schema.org/Person">
  <span itemprop="name">Jane Doe</span>
  <img src="janedoe.jpg" itemprop="image" />

  <span itemprop="jobTitle">Professor</span>
  <div itemprop="address" itemscope itemtype="http://schema.org/PostalAddress">
    <span itemprop="streetAddress">
      20341 Whitworth Institute
      405 N. Whitworth
    </span>
    <span itemprop="addressLocality">Seattle</span>,
    <span itemprop="addressRegion">WA</span>
    <span itemprop="postalCode">98052</span>
  </div>
  <span itemprop="telephone">(425) 123-4567</span>
  <a href="mailto:jane-doe@xyz.edu" itemprop="email">
    jane-doe@xyz.edu</a>

  Jane's home page:
  <a href="www.janedoe.com" itemprop="url">janedoe.com</a>

  Graduate students:
  <a href="www.xyz.edu/students/alicejones.html" itemprop="colleagues">
    Alice Jones</a>
  <a href="www.xyz.edu/students/bobsmith.html" itemprop="colleagues">
    Bob Smith</a>
</div>
XML;

$a = simplexml_load_string($xml);

if($a == false) {
	echo "XML not valid"; 
}
else {
	echo $a->asXML();
}