Changing Xml Node Name after Serialization

<?xml version="1.0"?>
<catalog>
   <bookid="bk101">
      <author>Gambardella, Matthew</author>
      <title>XML Developer's Guide</title>
      <publish_date>2000-10-01</publish_date>
   </book></catalog>

Now I want to chane publish_date Node to PublishedDate programatically, this node can be anywhere in xml, all the occurances I had to change,

KSR