Description:
------------
SimpleXMLelement has no children() on element with only attributes?

I try to retreive an element by xpath which goes without problems, The child elements it contains (same namespace) are all empty element with only attributes. However the returned SimpleXML element does not contain any children? so i'm unable to retreive there attributes.




Reproduce code:
---------------
<?php
$data = '<?xml version="1.0" encoding="utf-8"?>
<wsdl:definitions 
  xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" 
  targetNamespace="http://www.w3.org/2001/XMLSchema"
>
<wsdl:portType name="qxqPortType">
        <wsdl:operation name="SOAP_set">
            <wsdl:input message="SetRequest"/>
            <wsdl:output message="SetResponse"/>
        </wsdl:operation>
    <wsdl:operation name="SOAP_get">
            <wsdl:input message="GetRequest"/>
            <wsdl:output message="GetResponse"/>
        </wsdl:operation>        
</wsdl:portType>
</wsdl:definitions>';

echo '<pre>';
$xml = simplexml_load_string($data);
if ($xml)
{

  $res2 = $xml->xpath('//wsdl:portType/wsdl:operation');
  //print_r($res);
  foreach ($res2 as $child2)
  {
    //print_r($child2->children());
    echo 'child2'.PHP_EOL;
    print_r($child2->getName().PHP_EOL);
    print_r(count($child2->children()).PHP_EOL);
    print_r($child2);
    
    foreach ($child2->children() as $child3)
    {
      echo 'child3'.PHP_EOL;
      print_r($child3->getName().PHP_EOL);
      print_r(count($child3->children()).PHP_EOL);
      print_r($child3);
      foreach ($child3->children() as $child4)
      {
        echo 'child4'.PHP_EOL;
        print_r($child4->getName().PHP_EOL);
        print_r(count($child4->children()).PHP_EOL);
        print_r($child4);
      }
    }

  }
}
echo '</pre>';
?>

Expected result:
----------------
child2 & child3 & child4 should be printed..
 

child2
operation
2
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [name] => SOAP_set
        )

)
child2
operation
2
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [name] => SOAP_set
        )
   /* 2 another simplexml element input & output with children & attributes*/
)

Actual result:
--------------
Only child2 prints with 0 children

child2
operation
0
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [name] => SOAP_set
        )

)
child2
operation
0
SimpleXMLElement Object
(
    [@attributes] => Array
        (
            [name] => SOAP_get
        )

)