[xsl] Variable containing unique values

["Hesselberth, Jan" <Jan.Hesselberth@xxxxxxxxxxxxxxxxxx>]

I've read the book and looked at the examples but I can't manage to
create a variable containing unique values for my xml. All I get is a
list of all values.
I need a variable containing unique values for rolloverDate. I've tried
all sorts of rules for testing for current rolloverDate not being equal
to previous rollover dates but I can't get it to work.
Can you help please.
Regards
	Jan Hesselberth

The code I have is

	<xsl:variable name="unique-dates">
		<xsl:for-each
		select
="REPORT/Rollover/RolloverForecast/summaryAccount/element">
			<xsl:sort
select="/rolloverDate[not(preceding::rolloverDate= current())]"/>
		<xsl:copy-of select="."/>
		</xsl:for-each>
	</xsl:variable>

The xml snippet looks like

<summaryAccount id="12345">
	<isAutomatedRollover>N</isAutomatedRollover>
	<element id="1">
		<rolloverDate>2008-04-04</rolloverDate>
	</element>
	<element id="2">
		<rolloverDate>2008-04-04</rolloverDate>
	</element>
</summaryAccount>
<summaryAccount id="12346">
	<isAutomatedRollover>Y</isAutomatedRollover>
	<element id="1">
		<rolloverDate>2008-04-22</rolloverDate>
	</element>
</summaryAccount>
<summaryAccount id="12347">
	<isAutomatedRollover>Y</isAutomatedRollover>
	<element id="1">
		<rolloverDate>2008-04-22</rolloverDate>
	</element>
	<element id="2">
		<rolloverDate>2008-04-17</rolloverDate>
	</element>
</summaryAccount>



LEGAL NOTICE


The information contained in this e-mail and any attachments are private and
confidential.
This message is solely intended for a particular recipient, if you are not the
intended
recipient you are prohibited from storing, copying, disseminating or using the
information
in any way.  If you received this e-mail in error please notify the sender
immediately.
E-mail transmission cannot be guaranteed to be secure or error-free as
information could
be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or
contain viruses.
The sender therefore does not accept liability for any errors, viruses or
omissions in the
contents of this message, which arise as a result of transmission. This e-mail
is not
intended to create legally binding commitments on behalf of Northern Rock plc,
nor do its
contents reflect the corporate views or policies of Northern Rock plc.

Northern Rock plc,
Registered Office Northern Rock House Gosforth Newcastle upon Tyne NE3 4PL.
Registered in England, number 3273685. Telephone No: 0191 2857191

Northern Rock plc is authorised and regulated by the Financial Services
Authority for
deposit-taking; advising on and arranging mortgages and general insurance; and
for
introducing life assurance and investments.

______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please visit http://www.messagelabs.com/email
______________________________________________________________________