<?php

$xml = "xml2.xml";

$source = new DOMDocument();
$source->load(utf8_encode($xml));
$xpath = new DOMXpath($source);
$xpath->registerNamespace('ps', 'http://www.audatex.com/SAXIF');

foreach ($xpath->evaluate('//ps:Partnership') as $index => $partnership) {
  $target = new DOMDocument();
  $target->appendChild($target->importNode($partnership, TRUE));

  echo "\n", ($index + 1).'.xml', "\n\n";
  echo $target->save();
}
?>

/* ERROR I GET:

1.xml
Warning: DOMDocument::save() expects at least 1 parameter, 0 given in C:\xampp\htdocs\xampp\provisioning\file.php on line 15
2.xml
Warning: DOMDocument::save() expects at least 1 parameter, 0 given in C:\xampp\htdocs\xampp\provisioning\file.php on line 15
3.xml
Warning: DOMDocument::save() expects at least 1 parameter, 0 given in C:\xampp\htdocs\xampp\provisioning\file.php on line 15
4.xml
Warning: DOMDocument::save() expects at least 1 parameter, 0 given in C:\xampp\htdocs\xampp\provisioning\file.php on line 15

*/