Percorrer XML

$oldSetting = libxml_use_internal_errors( true );
libxml_clear_errors();

$html = new DOMDocument();
$html->loadHtmlFile($_POST['url']);

$xpath = new DOMXPath( $html );
$elements = $xpath->query( "//table[@class='maintable']/tr//a" );

foreach ( $elements as $item ) {
  $newDom = new DOMDocument;
  $newDom->appendChild($newDom->importNode($item,true));

  $xpath = new DOMXPath( $newDom );

  foreach ($item->attributes as $attribute) {

    for ($node = $item->firstChild; $node !== NULL;
         $node = $node->nextSibling) {
      if (($attribute->nodeName =='valign') && ($attribute->nodeValue=='href'))
      {
        //print($node->nodeValue);
        echo $attribute->nodeValue;
      }
      else
      {
        //print("<br>".$node->nodeValue);
        echo $attribute->nodeValue.'0555';
      }
    }
    print("<br>");
  }
}

libxml_clear_errors();
libxml_use_internal_errors($oldSetting);