Description:
------------
dom_import_simplexml(), when given a simplexml_element that is part of a larger simplexml nesting, will import the parent of the element provided, not the element itself.  

Reproduce code:
---------------
<?
$dom = new domdocument;
$s = simplexml_load_string('<a>Foo<b>Bar<c/></b></a>');
$el = dom_import_simplexml($s->b->c);
$el = $dom->importNode($el, TRUE);
$dom->appendChild($el);
print $dom->saveXML();
?>


Expected result:
----------------
<?xml version="1.0"?>
<c/>

Actual result:
--------------
<?xml version="1.0"?>
<b>Bar<c/></b>