Description:
------------
"clone $simpleXML->subElement1->subElement2" does not work as excepted.

It does not return a clone of itself but a clone of it's parent.

Tested on:
Windows with PHP 5.2.0
Linux with PHP 5.2.0
Linux with PHP 5.0.4

Reproduce code:
---------------
$xml = '<?xml version="1.0" ?>
<test>
    <level1>
        <level2a>text1</level2a>
        <level2b>text2</level2b>
   </level1>
</test>';
$test = simplexml_load_string($xml);

print_r($test->level1->level2a);

$test2 = clone $test;
print_r($test2->level1->level2a);

$test3 = clone $test->level1->level2a;
print_r($test3);

Expected result:
----------------
SimpleXMLElement Object
(
    [0] => text1
)
SimpleXMLElement Object
(
    [0] => text1
)
SimpleXMLElement Object
(
    [0] => text1
)


Actual result:
--------------
SimpleXMLElement Object
(
    [0] => text1
)
SimpleXMLElement Object
(
    [0] => text1
)
SimpleXMLElement Object
(
    [level2a] => text1
    [level2b] => text2
)