XML encoding format

Hi,

I have an issue that is, i have generated a xml file. Now when we open the xml through browser we are getting encoding as "UTF-8"(Upper case) whereas if we open the same xml using notepad++ we are getting encoding as "utf-8"(Lower case) as shown below,

when opened in IE

<?xml version="1.0" encoding="UTF-8"?>

when opened with Notepad++

<?xml version="1.0" encoding="utf-8"?>

we need to print encoding in uppercase in notepad as well as it is printing in IE.

For generating Xml file we have used Xml Stylesheet as- 

<?xml version="1.0" encoding="UTF-8"?>

<xsl:stylesheet><xsl:output method="xml" encoding="UTF-8" />

How can we achieve it?

Thanks in Advance.

Usman