在XSL中得到任意节点在DOM树中的深度

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href=http://www.ddvip.com/web/xml/index2/"TestDeep.xsl"?>
<root>
<level-1>
<level-1-1>
<level-1-1-1/>
</level-1-1>
<level-1-2/>
</level-1>
<level-2>
<level-2-1>
</level-2-1>
<level-2-2>
<level-2-2-1/>
</level-2-2>
</level-2>
</root>

TestNodeDeep.xsl

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="ttp://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<xsl:for-each select="//*">
<xsl:value-of select="local-name()"/> ＝
<xsl:value-of select="count(ancestor::*)"/>
<br/>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>