Description:
------------
DomDocument interpolates the ' and " entities to their values 
(' and "). Other entities like > etc. are displayed as is.

Tested with php version 5.2.6 (self-compiled under debian), 5.2.9 and 
5.3RC1 on MacOSX. Further version infos can be posted if needed.

Reproduce code:
---------------
<?php

// create document (keep it simple)
$domImp = new DomImplementation();
$dom = $domImp->createDocument(null, 'root');

// create element
$foo = $dom->createElement('foo', '&apos; &quot;'); // bug here
$dom->documentElement->appendChild($foo);

echo $dom->saveXML();

Expected result:
----------------
<?xml version="1.0"?>
<root><foo>&apos; &quot;</foo></root>

Actual result:
--------------
<?xml version="1.0"?>
<root><foo>' "</foo></root>