[xsl] grouping by unique...

["Fei Zheng" <Fei.Zheng@xxxxxxx>]

I'd like to have an unique solution list.  Anyone can tell what's wrong with the following code which gives all solutions instead of the unique solutions?

The output needs to be: A B C D instead of A A B B C D. 

Thanks in advance for the help!

Here is the code.
<xsl:template match="report">
	<xsl:variable name="unique-solutions" 
    	      select="item[not(metadata/solution = preceding-sibling::metadata/solution)]/metadata/solution"	/>
					
	<xsl:for-each select="$unique-solutions">
		<xsl:sort select="." />
		<xsl:value-of select="." />
	</xsl:for-each>				
</xsl:template>


Here is the XML file.
<report>
	<item>
		<content>
			....
		</content>
		<metadata>
			<solution>A</solution>
			<solution>B</solution>
			<solution>C</solution>
		</metadata>
	</item>
	<item>
		<content>
			.....
		</content>
		<metadata>
			<solution>A</solution>
			<solution>B</solution>
			<solution>D</solution>
		</metadata>
	</item>

</report



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