How Can I Get Inner Xml Data Of An Xml Tag

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PHP

$xml = new DOMDocument();
$xml->load('xml.php.xml');
$feed = array();
foreach ($xml->getElementsByTagName('Listing') as $node) 
{
  $Image=$node->getElementsByTagName('Image')->item(0)->nodeValue;
  echo($Image)
}

This image tag contain some xml tags
i would like to print inner xml text of this image tag
like
"

<imagename>j.jpg</imagename>
<format>jpg</format>

"



using this code only i can print values only
"
j.jpgjpg
"