Description:
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$document = new DOMDocument()->load(...);
$document->getElementsByTagName(<root element name>) works (returns list with one element).
getElementsByTagName(<non root element name>) always return an empty list. Examples on notes and on the web (some examples claimed to be working are prior the 5.3.2) are all  not working.

Tested on LAMP server PHP 5.2.8 AND on XAMPPLite WAMP PHP 5.3.1, both not working.

Test script:
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$doc = new DOMDocument();
$doc->load('__xml/faq.xml');
$faqs = $doc->getElementsByTagName("faq");
echo $faqs->length; // always 0



__xml/faq.xml is:

<?xml version="1.0" encoding="iso-8859-1"?>
<faqs>
	<faq>
		<domanda>domanda1</domanda>
		<risposta>risposta1</risposta>
	</faq>
	<faq>
		<domanda>domanda2</domanda>
		<risposta>risposta2</risposta>
	</faq>
	<faq>
		<domanda>domanda3</domanda>
		<risposta>risposta3</risposta>
	</faq>
</faqs>