[дурацкий XML] помогите с добавлением фильтра

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN"

"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	onload="OnLoadEvent(evt)">
<g id="Scene"></g>

<script type="text/ecmascript"><![CDATA[

function OnLoadEvent(evt)

{ parent.AddSVGObject(evt.target.ownerDocument);

}

]]></script>

</svg>

<xsl:stylesheet exclude-result-prefixes="giml" version="1.1" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output encoding="UTF-8"
			method="xml"
			indent="yes"/>
<xsl:template match="/">
</xsl:template>
  <xsl:template match="node() | @*">
	<xsl:copy>
	  <xsl:apply-templates select="@* | node()">
		<xsl:sort select="@z-index" data-type="number"/>   
	  </xsl:apply-templates>
	</xsl:copy>


  </xsl:template>

  <xsl:template match="@z-index"/>
</xsl:stylesheet>