Try adding the omit-xml-declaration="yes" attribute to your xsl:output tag.
It should then read like this:
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes" />
Try adding the omit-xml-declaration="yes" attribute to your xsl:output tag.
It should then read like this:
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes" />