[xsl] listing links in xsl?

["james walker" <jameswalkerandy@xxxxxxxxxxx>]

given this xml structure (there are many links inside root):
<root>
<link>
<title>.......</title>
<url>....</url>
<description>.....s</description>
</link>
<root>

i am trying to list the links on a web page by ndl links (links that contain 
'.ndl') and then by html links. So far i have created a key:
xsl:key name="ndl-links" match="link" use="contains(url, '.ndl')=true" />
which i though would assign a key to the links which contain '.ndl'?

when i try and loop through the key it doesnt show the ndl links, however it 
does show the html links?

<xsl:template match="root">
	<ul>

	<xsl:for-each select="key('ndl-links', contains(url, '.ndl')=true)">
		<xsl:variable name="urlink" select="url" />
		<li>
			<a href="$urlink"><xsl:value-of select="title" /></a>
			<p><xsl:value-of select="description"/></p>
		</li>
	</xsl:for-each>


	</ul>
</xsl:template>
i think it may be that i defined the key incorrectly but i just cant seem to 
wort it out? sos if this seems simple.
cheers
james

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