error with saxon

hello,
I have an xml file that I would transform it to svg format with xslt. I use the saxon processor, and xmlspy, but when i try to built it I get the follow error that I don't know how correct it, have you an idea?:
C:\saxon>saxon c:\Cambridge.xml c:\Untitled1.xsl
Error at xsl:value-of on line 5 of file:/c:/Untitled1.xsl:
The URI http://www.w3.org/2003/11/xpath-function does not identify an external  Java class
Transformation failed: Run-time errors were reported


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The file untitled1.xsl:
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?xml version="1.0"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xlink="http://www.w3.org/TR/xlink" xmlns:gml="http://www.opengis.net/gml" xmlns:fn="http://www.w3.org/2003/11/xpath-function" xmlns:saxon="http://icl.com/saxon" xmlns:pre1="http://www.opengis.net/examples">
<xsl:output method="xml" doctype-system="http://www.w3.org/TR/2000/03/WD-SVG-20000303/DTD/svg-20000303-stylable.dtd" doctype-public="-//W3C//DTD SVG 20000303 Stylable//EN"/>
	<xsl:variable name="viewBoxValue">
		<xsl:value-of select="fn:tokenize(*/gml:boundedBy/gml:Box/gml:coord ,' \s* ')"/>
	</xsl:variable>
	<xsl:template match="/">
		<xsl:element name="svg">
			<xsl:attribute name="viewBox"><xsl:value-of select="$viewBoxValue"/></xsl:attribute>
			<!--apply template to each GML geometry property-->
			<xsl:apply-templates select="//pre1:cityMember/gml:centerLineOf"/>
		</xsl:element>
	</xsl:template>
	<xsl:template match="pre1:cityMember/gml:centerLineOf">
		<xsl:element name="path">
			<xsl:attribute name="style">stroke-width:fill:none;stroke:rgb(69,34,118);</xsl:attribute>
			<xsl:attribute name="d"><xsl:value-of select="fn:tokenize(./gml:coord, ' \s *')"/>
			</xsl:attribute>
		</xsl:element>
	</xsl:template>
</xsl:stylesheet>


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