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[xsl] SELECT DISTINCT QUERY

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I want to execute a SELECT DISTINCT querry in a node tree.

A have a node tree below

	<salesStaff>
		<person name="john" date="5/22/2003" time="10:00" duration="2" />
		<person name="john" date="5/22/2003" time="12:00" duration="1" />
		<person name="john" date="5/22/2003" time="13:00" duration="2" />
		<person name="marry" date="5/22/2003" time="12:00" duration="1" />
		<person name="bob" date="5/22/2003" time="9:00" duration="2" />
		<person name="bob" date="5/22/2003" time="11:00" duration="2" />
		<person name="john" date="5/22/2003" time="11:00" duration="2" />
		<person name="john" date="5/23/2003" time="10:00" duration="1" />
		<person name="jan" date="5/23/2003" time="10:00" duration="2" />
		<person name="sany" date="5/23/2003" time="19:00" duration="2" />
		<person name="marry" date="5/23/2003" time="15:00" duration="2" />
	</salesStaff>

	How can I have a query like "SELECT DISTINCT name FROM salesStaff WHERE date = $today"
	This will return the names of the salesmen who has an appointment today.
	But each name must be returned only once.

Thanks.
Onur



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