Converting Xml to string from fetch

Hi

   I am trying to retrieve the subject of an email template using fetch xml. But I am getting it in the form of xml

"<?xml version="1.0" ?><xsl:stylesheet xmlns:xsl="www.w3.org/.../Transform" version="1.0"><xsl:output method="text" indent="no" /><xsl:template match="/data"><![CDATA[We haven't heard from you...]]></xsl:template></xsl:stylesheet>"

I want to change/append data in subject. Any suggestions on how to do so?