select distinct?

Hi,
I'm using the original IE5 xml parser and I would like to do a select on all
authors attributes in the xml-file, but I only want distinct values. How?

The code I'm using for the moment:
<xsl:for-each select="//@author" order-by=".">
	<xsl:value-of/><br />
</xsl:for-each>

- Mattias



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