Do a copy of a document but avoid duplicates in certai

I have the following problem:

I want a perfect copy of an xhtml document but want avoid coping 
duplicates "li"s in all "ul" lists.

I tried:

	<xsl:template match="node()|@*">
		<xsl:copy>
			<xsl:apply-templates select="node()|@*"/>
		</xsl:copy>
	</xsl:template>	

	<xsl:template match="ul" >
		<xsl:comment>From Here</xsl:comment>
		<xsl:copy >
			<xsl:for-each select="li[not(.=following-sibling::li)]">
				<xsl:copy>
					<xsl:apply-templates select="node()|@*"/>
				</xsl:copy>
			</xsl:for-each>
		</xsl:copy>
	</xsl:template>

but it does not work.
It does not even touch the ul template?
If the document node would be "ul" it works???

Any help available.

Thanks in advance

Mit freundlichem Gruß / Best Regards
Georg Lenz
Java IDE Core
SAP AG

Neurottstrasse 16
69190 Walldorf
T   +49-6227-7-64235
F   +49-6227-7-74235
E   georg.lenz@xxxxxxx



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