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

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns="http://www.w3.org/1999/xhtml">
	<xsl:output method="xml" indent="yes" />

	<xsl:key name="order" match="//Item" use="Order/text()" />

	<xsl:template match="/">
		<xsl:for-each select="//Item[generate-id()=generate-id(key('order', Order/text()))]">
			<Group order="{Order/text()}">
				<xsl:for-each select="key('order', current()/Order/text())">
					<xsl:copy>
						<xsl:copy-of select="node()[not(name()='Order')]" />
					</xsl:copy>
				</xsl:for-each>
			</Group>
		</xsl:for-each>
	</xsl:template>
</xsl:stylesheet>