If you're using XSLT, the fact that it's a CDATA section is irrelevant: CDATA is just an alternative way of escaping special characters. So
<a><![CDATA[<<<]]></a>
is just another way of writing
<a><<<</a>
But you can output the content of the <Script> element to a file using:
<xsl:stylesheet ...
<xsl:output method="text"/>
<xsl:template match="/">
<xsl:value-of select="//Script"/>
</xsl:template>
</xsl:stylesheet>
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference