Hi,
I am new to XSL. I don't know how to loop through XML and filter duplicates using XSL. I tried several ways but i could hot get it done. Here is my requirement.

My XML
---------
<?xml version="1.0" ?>
<X12Summary>
<Unit volume="10" Amount="100">
<Identifier Name="Customer ID" Value="12345" />
<Identifier Name="Customer Name" Value="Jones Thomas" />
<?xml version="1.0" ?>
<X12Summary>
<Unit volume="10" Amount="100">
<Identifier Name="Customer ID" Value="12345" />
<Identifier Name="Customer Name" Value="Jones Thomas" />
<Identifier Name="Address" Value="addr1" />
<Identifier Name="City" Value="Atlanta" />
<Identifier Name="Zipcode" Value="10231" />
<Identifier Name="Brand" Value="new" />
<Identifier Name="TimeZone" Value="EST" />
</Unit>
<Unit volume="10" Amount="1000">
<Identifier Name="Customer ID" Value="12345" />
<Identifier Name="Customer Name" Value="Jones Thomas" />
<Identifier Name="Address" Value="addr2" />
<Identifier Name="City" Value="Chicago" />
<Identifier Name="Zipcode" Value="10232" />
<Identifier Name="Brand" Value="old" />
<Identifier Name="TimeZone" Value="EST" />
</Unit>
<Unit volume="10" Amount="1500">
<Identifier Name="Customer ID" Value="12345" />
<Identifier Name="Customer Name" Value="Jones Thomas" />
<Identifier Name="Address" Value="addr3" />
<Identifier Name="City" Value="Dallas" />
<Identifier Name="Zipcode" Value="16232" />
<Identifier Name="Brand" Value="new" />
<Identifier Name="TimeZone" Value="CST" />
</Unit>
<Unit volume="10" Amount="1500">
<Identifier Name="Customer ID" Value="23451" />
<Identifier Name="Customer Name" Value="David Beckley" />
<Identifier Name="Address" Value="addr4" />
<Identifier Name="City" Value="mexico" />
<Identifier Name="Zipcode" Value="15732" />
<Identifier Name="Brand" Value="new" />
<Identifier Name="TimeZone" Value="CST" />
</Unit>
<Unit volume="10" Amount="1520">
<Identifier Name="Customer ID" Value="23451" />
<Identifier Name="Customer Name" Value="David Beckley" />
<Identifier Name="Address" Value="addr5" />
<Identifier Name="City" Value="UAE" />
<Identifier Name="Zipcode" Value="1245125" />
<Identifier Name="Brand" Value="new" />
<Identifier Name="TimeZone" Value="PST" />
</Unit>
</X12Summary> <Identifier Name="Address" Value="addr1" />
<Identifier Name="City" Value="Atlanta" />
<Identifier Name="Zipcode" Value="10231" />
<Identifier Name="Brand" Value="new" />
<Identifier Name="TimeZone" Value="EST" />
</Unit>
<Unit volume="10" Amount="1000">
<Identifier Name="Customer ID" Value="12345" />
<Identifier Name="Customer Name" Value="Jones Thomas" />
<Identifier Name="Address" Value="addr2" />
<Identifier Name="City" Value="Chicago" />
<Identifier Name="Zipcode" Value="10232" />
<Identifier Name="Brand" Value="old" />
<Identifier Name="TimeZone" Value="EST" />
</Unit>
<Unit volume="10" Amount="1500">
<Identifier Name="Customer ID" Value="12345" />
<Identifier Name="Customer Name" Value="Jones Thomas" />
<Identifier Name="Address" Value="addr3" />
<Identifier Name="City" Value="Dallas" />
<Identifier Name="Zipcode" Value="16232" />
<Identifier Name="Brand" Value="new" />
<Identifier Name="TimeZone" Value="CST" />
</Unit>
<Unit volume="10" Amount="1500">
<Identifier Name="Customer ID" Value="23451" />
<Identifier Name="Customer Name" Value="David Beckley" />
<Identifier Name="Address" Value="addr4" />
<Identifier Name="City" Value="mexico" />
<Identifier Name="Zipcode" Value="15732" />
<Identifier Name="Brand" Value="new" />
<Identifier Name="TimeZone" Value="CST" />
</Unit>
<Unit volume="10" Amount="1520">
<Identifier Name="Customer ID" Value="23451" />
<Identifier Name="Customer Name" Value="David Beckley" />
<Identifier Name="Address" Value="addr5" />
<Identifier Name="City" Value="UAE" />
<Identifier Name="Zipcode" Value="1245125" />
<Identifier Name="Brand" Value="new" />
<Identifier Name="TimeZone" Value="PST" />
</Unit>
</X12Summary>

Output should be in HTML table like this
------------------------------------
12345 - Jones Thomas

Address City Zipcode Brand TimeZone Amount
addr1 Atlanta 10231 new EST 100
addr2 Chicago 10232 old EST 1000
addr3 Dallas 16232 new CST 1500


23451 - David Beckley

Address City Zipcode Brand TimeZone Amount
addr4 mexico 15732 new CST 1500
addr5 UAE 1245125 old PST 1520

Can anyone please help me to get XSL for this. Thanks in advance.

Decide whether you want to use XSLT 2.0 or 1.0. With 2.0 you can use for-each-group http://www.w3.org/TR/xslt20/#grouping-examples to group your input XML, with XSLT 1.0 you can use Muenchian grouping: http://www.jenitennison.com/xslt/grouping/index.xml

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Martin Honnen
Microsoft MVP (XML, Data Platform Development) 2005/04 - 2013/03
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