I need to eliminate duplicate elements from my XML using a specific node (ItemID)

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Editorial Team

Asked: June 5, 20262026-06-05T05:30:03+00:00 2026-06-05T05:30:03+00:00

I need to eliminate duplicate elements from my XML using a specific node (ItemID)

0

I need to eliminate duplicate elements from my XML using a specific node (ItemID)

My XML Looks as follows;

<XML>
    <Line>
        <SupplierID>Waltons</SupplierID>
        <InvoiceID>CAP600795SI</InvoiceID>
        <InvoiceDate>20100506</InvoiceDate>
        <ItemID>723073</ItemID>
        <ColorID>02</ColorID>
        <Description>Pentel LR7 Energel Metal Tip Refill 0.7mm</Description>
        <MainCategory>WRITING INSTRUMENTS</MainCategory>
        <SubCategory>Refill</SubCategory>
        <LineNum>               1.0000000</LineNum>
        <Qty>               6.0000000</Qty>
        <UnitPriceExclTax>              10.0200000</UnitPriceExclTax>
        <LineTax>               8.4200000</LineTax>
        <LinePriceExclTax>              60.1200000</LinePriceExclTax>
        <ColorName>Black</ColorName>
        <UOM>EA</UOM>
        <Backorder>               0.0000000</Backorder>
        <INVENTTRANSID>      CAP5637542_060</INVENTTRANSID>
    </Line>
    <Line>
        <SupplierID>Waltons</SupplierID>
        <InvoiceID>CAP600795SI</InvoiceID>
        <InvoiceDate>20100506</InvoiceDate>
        <ItemID>903420</ItemID>
        <ColorID />
        <Description>STEPHENS JUNIOR Stapler Half Strip KW586</Description>
        <MainCategory>OFFICE SUNDRIES</MainCategory>
        <SubCategory>Staplers</SubCategory>
        <LineNum>               2.0000000</LineNum>
        <Qty>               3.0000000</Qty>
        <UnitPriceExclTax>              32.2500000</UnitPriceExclTax>
        <LineTax>              13.5400000</LineTax>
        <LinePriceExclTax>              96.7500000</LinePriceExclTax>
        <ColorName />
        <UOM>Ea</UOM>
        <Backorder>               0.0000000</Backorder>
        <INVENTTRANSID>      CAP5637547_060</INVENTTRANSID>
    </Line>
    <Line>
        <SupplierID>Waltons</SupplierID>
        <InvoiceID>CAP600795SI</InvoiceID>
        <InvoiceDate>20100506</InvoiceDate>
        <ItemID>867241</ItemID>
        <ColorID />
        <Description>TRODAT PRINTY S/Inking Stamp Copy 4911</Description>
        <MainCategory>STAMPS DATERS NUMBERERS</MainCategory>
        <SubCategory>Self Inking Stamps</SubCategory>
        <LineNum>               3.0000000</LineNum>
        <Qty>               1.0000000</Qty>
        <UnitPriceExclTax>              42.1500000</UnitPriceExclTax>
        <LineTax>               5.9000000</LineTax>
        <LinePriceExclTax>              42.1500000</LinePriceExclTax>
        <ColorName />
        <UOM>Ea</UOM>
        <Backorder>               1.0000000</Backorder>
        <INVENTTRANSID>      CAP5637548_060</INVENTTRANSID>
    </Line>
    <Line>
        <SupplierID>Waltons</SupplierID>
        <InvoiceID>CAP600795SI</InvoiceID>
        <InvoiceDate>20100506</InvoiceDate>
        <ItemID>941151</ItemID>
        <ColorID />
        <Description>PENTEL Correction Tape 5mx5mm ZT35</Description>
        <MainCategory>OFFICE SUNDRIES</MainCategory>
        <SubCategory>Correction Fluid/Pens/Tape</SubCategory>
        <LineNum>               4.0000000</LineNum>
        <Qty>               2.0000000</Qty>
        <UnitPriceExclTax>              25.1500000</UnitPriceExclTax>
        <LineTax>               7.0400000</LineTax>
        <LinePriceExclTax>              50.3000000</LinePriceExclTax>
        <ColorName />
        <UOM>Ea</UOM>
        <Backorder>               0.0000000</Backorder>
        <INVENTTRANSID>      CAP5637549_060</INVENTTRANSID>
    </Line>
    <Line>
        <SupplierID>Waltons</SupplierID>
        <InvoiceID>CAP600795SI</InvoiceID>
        <InvoiceDate>20100506</InvoiceDate>
        <ItemID>801215</ItemID>
        <ColorID />
        <Description>MONDI ROTATRIM Copy Paper A4 80Gsm White</Description>
        <MainCategory>A4 Paper</MainCategory>
        <SubCategory>White Bond Paper</SubCategory>
        <LineNum>               5.0000000</LineNum>
        <Qty>             100.0000000</Qty>
        <UnitPriceExclTax>              29.0100000</UnitPriceExclTax>
        <LineTax>             406.1400000</LineTax>
        <LinePriceExclTax>            2901.0000000</LinePriceExclTax>
        <ColorName />
        <UOM>Pkt 500</UOM>
        <Backorder>               0.0000000</Backorder>
        <INVENTTRANSID>      CAP5637552_060</INVENTTRANSID>
    </Line>
    <Line>
        <SALESID>         CAP716197SO</SALESID>
        <INVOICEID>         CAP600795SI</INVOICEID>
        <INVOICEDATE>2010/05/06</INVOICEDATE>
        <NUMBERSEQUENCEGROUP />
        <LINENUM>               2.0000000</LINENUM>
        <ITEMID>805236</ITEMID>
        <INVENTDIMID>      CAP0000594_061</INVENTDIMID>
        <NAME>Ruled Paper A4 Fnt/Marg JD76</NAME>
        <CONFIRMEDDLV>2010/05/06</CONFIRMEDDLV>
        <INVENTTRANSID>      CAP5637543_060</INVENTTRANSID>
        <QTYSALES>               4.0000000</QTYSALES>
        <QTYORDERED>               4.0000000</QTYORDERED>
        <QTYBACKORDERSALES>               4.0000000</QTYBACKORDERSALES>
        <QTYBACKORDERINVENT>               4.0000000</QTYBACKORDERINVENT>
        <SALESUNIT>EA</SALESUNIT>
        <ORIGSALESID>         CAP716197SO</ORIGSALESID>
        <DATAAREAID>wal</DATAAREAID>
        <RECID>622392608</RECID>
        <RecVersion>1</RecVersion>
    </Line>
    <Line>
        <SALESID>         CAP716197SO</SALESID>
        <INVOICEID>         CAP600795SI</INVOICEID>
        <INVOICEDATE>2010/05/06</INVOICEDATE>
        <NUMBERSEQUENCEGROUP />
        <LINENUM>               3.0000000</LINENUM>
        <ITEMID>941150</ITEMID>
        <INVENTDIMID>      CAP0000594_061</INVENTDIMID>
        <NAME>PENGUIN Correction Fluid 20ml White</NAME>
        <CONFIRMEDDLV>2010/05/06</CONFIRMEDDLV>
        <INVENTTRANSID>      CAP5637546_060</INVENTTRANSID>
        <QTYSALES>               6.0000000</QTYSALES>
        <QTYORDERED>               6.0000000</QTYORDERED>
        <QTYBACKORDERSALES>               6.0000000</QTYBACKORDERSALES>
        <QTYBACKORDERINVENT>               6.0000000</QTYBACKORDERINVENT>
        <SALESUNIT>EA</SALESUNIT>
        <ORIGSALESID>         CAP716197SO</ORIGSALESID>
        <DATAAREAID>wal</DATAAREAID>
        <RECID>622392609</RECID>
        <RecVersion>1</RecVersion>
    </Line>
    <Line>
        <SALESID>         CAP716197SO</SALESID>
        <INVOICEID>         CAP600795SI</INVOICEID>
        <INVOICEDATE>2010/05/06</INVOICEDATE>
        <NUMBERSEQUENCEGROUP />
        <LINENUM>               5.0000000</LINENUM>
        <ITEMID>867241</ITEMID>
        <INVENTDIMID>      CAP0000594_061</INVENTDIMID>
        <NAME>TRODAT PRINTY S/Inking Stamp Copy 4911</NAME>
        <CONFIRMEDDLV>2010/05/06</CONFIRMEDDLV>
        <INVENTTRANSID>      CAP5637548_060</INVENTTRANSID>
        <QTYSALES>               2.0000000</QTYSALES>
        <QTYORDERED>               2.0000000</QTYORDERED>
        <QTYBACKORDERSALES>               1.0000000</QTYBACKORDERSALES>
        <QTYBACKORDERINVENT>               1.0000000</QTYBACKORDERINVENT>
        <SALESUNIT>EA</SALESUNIT>
        <ORIGSALESID>         CAP716197SO</ORIGSALESID>
        <DATAAREAID>wal</DATAAREAID>
        <RECID>622392610</RECID>
        <RecVersion>1</RecVersion>
    </Line>
</XML>

You will see the XML is not identical but the tag is always in the same place, and there is currently 1 duplicate 867241

I do not want the order to change, just the element removed.

Desired output would be;

<XML>
    <Line>
        <SupplierID>Waltons</SupplierID>
        <InvoiceID>CAP600795SI</InvoiceID>
        <InvoiceDate>20100506</InvoiceDate>
        <ItemID>723073</ItemID>
        <ColorID>02</ColorID>
        <Description>Pentel LR7 Energel Metal Tip Refill 0.7mm</Description>
        <MainCategory>WRITING INSTRUMENTS</MainCategory>
        <SubCategory>Refill</SubCategory>
        <LineNum>               1.0000000</LineNum>
        <Qty>               6.0000000</Qty>
        <UnitPriceExclTax>              10.0200000</UnitPriceExclTax>
        <LineTax>               8.4200000</LineTax>
        <LinePriceExclTax>              60.1200000</LinePriceExclTax>
        <ColorName>Black</ColorName>
        <UOM>EA</UOM>
        <Backorder>               0.0000000</Backorder>
        <INVENTTRANSID>      CAP5637542_060</INVENTTRANSID>
    </Line>
    <Line>
        <SupplierID>Waltons</SupplierID>
        <InvoiceID>CAP600795SI</InvoiceID>
        <InvoiceDate>20100506</InvoiceDate>
        <ItemID>903420</ItemID>
        <ColorID />
        <Description>STEPHENS JUNIOR Stapler Half Strip KW586</Description>
        <MainCategory>OFFICE SUNDRIES</MainCategory>
        <SubCategory>Staplers</SubCategory>
        <LineNum>               2.0000000</LineNum>
        <Qty>               3.0000000</Qty>
        <UnitPriceExclTax>              32.2500000</UnitPriceExclTax>
        <LineTax>              13.5400000</LineTax>
        <LinePriceExclTax>              96.7500000</LinePriceExclTax>
        <ColorName />
        <UOM>Ea</UOM>
        <Backorder>               0.0000000</Backorder>
        <INVENTTRANSID>      CAP5637547_060</INVENTTRANSID>
    </Line>
    <Line>
        <SupplierID>Waltons</SupplierID>
        <InvoiceID>CAP600795SI</InvoiceID>
        <InvoiceDate>20100506</InvoiceDate>
        <ItemID>867241</ItemID>
        <ColorID />
        <Description>TRODAT PRINTY S/Inking Stamp Copy 4911</Description>
        <MainCategory>STAMPS DATERS NUMBERERS</MainCategory>
        <SubCategory>Self Inking Stamps</SubCategory>
        <LineNum>               3.0000000</LineNum>
        <Qty>               1.0000000</Qty>
        <UnitPriceExclTax>              42.1500000</UnitPriceExclTax>
        <LineTax>               5.9000000</LineTax>
        <LinePriceExclTax>              42.1500000</LinePriceExclTax>
        <ColorName />
        <UOM>Ea</UOM>
        <Backorder>               1.0000000</Backorder>
        <INVENTTRANSID>      CAP5637548_060</INVENTTRANSID>
    </Line>
    <Line>
        <SupplierID>Waltons</SupplierID>
        <InvoiceID>CAP600795SI</InvoiceID>
        <InvoiceDate>20100506</InvoiceDate>
        <ItemID>941151</ItemID>
        <ColorID />
        <Description>PENTEL Correction Tape 5mx5mm ZT35</Description>
        <MainCategory>OFFICE SUNDRIES</MainCategory>
        <SubCategory>Correction Fluid/Pens/Tape</SubCategory>
        <LineNum>               4.0000000</LineNum>
        <Qty>               2.0000000</Qty>
        <UnitPriceExclTax>              25.1500000</UnitPriceExclTax>
        <LineTax>               7.0400000</LineTax>
        <LinePriceExclTax>              50.3000000</LinePriceExclTax>
        <ColorName />
        <UOM>Ea</UOM>
        <Backorder>               0.0000000</Backorder>
        <INVENTTRANSID>      CAP5637549_060</INVENTTRANSID>
    </Line>
    <Line>
        <SupplierID>Waltons</SupplierID>
        <InvoiceID>CAP600795SI</InvoiceID>
        <InvoiceDate>20100506</InvoiceDate>
        <ItemID>801215</ItemID>
        <ColorID />
        <Description>MONDI ROTATRIM Copy Paper A4 80Gsm White</Description>
        <MainCategory>A4 Paper</MainCategory>
        <SubCategory>White Bond Paper</SubCategory>
        <LineNum>               5.0000000</LineNum>
        <Qty>             100.0000000</Qty>
        <UnitPriceExclTax>              29.0100000</UnitPriceExclTax>
        <LineTax>             406.1400000</LineTax>
        <LinePriceExclTax>            2901.0000000</LinePriceExclTax>
        <ColorName />
        <UOM>Pkt 500</UOM>
        <Backorder>               0.0000000</Backorder>
        <INVENTTRANSID>      CAP5637552_060</INVENTTRANSID>
    </Line>
    <Line>
        <SALESID>         CAP716197SO</SALESID>
        <INVOICEID>         CAP600795SI</INVOICEID>
        <INVOICEDATE>2010/05/06</INVOICEDATE>
        <NUMBERSEQUENCEGROUP />
        <LINENUM>               2.0000000</LINENUM>
        <ITEMID>805236</ITEMID>
        <INVENTDIMID>      CAP0000594_061</INVENTDIMID>
        <NAME>Ruled Paper A4 Fnt/Marg JD76</NAME>
        <CONFIRMEDDLV>2010/05/06</CONFIRMEDDLV>
        <INVENTTRANSID>      CAP5637543_060</INVENTTRANSID>
        <QTYSALES>               4.0000000</QTYSALES>
        <QTYORDERED>               4.0000000</QTYORDERED>
        <QTYBACKORDERSALES>               4.0000000</QTYBACKORDERSALES>
        <QTYBACKORDERINVENT>               4.0000000</QTYBACKORDERINVENT>
        <SALESUNIT>EA</SALESUNIT>
        <ORIGSALESID>         CAP716197SO</ORIGSALESID>
        <DATAAREAID>wal</DATAAREAID>
        <RECID>622392608</RECID>
        <RecVersion>1</RecVersion>
    </Line>
    <Line>
        <SALESID>         CAP716197SO</SALESID>
        <INVOICEID>         CAP600795SI</INVOICEID>
        <INVOICEDATE>2010/05/06</INVOICEDATE>
        <NUMBERSEQUENCEGROUP />
        <LINENUM>               3.0000000</LINENUM>
        <ITEMID>941150</ITEMID>
        <INVENTDIMID>      CAP0000594_061</INVENTDIMID>
        <NAME>PENGUIN Correction Fluid 20ml White</NAME>
        <CONFIRMEDDLV>2010/05/06</CONFIRMEDDLV>
        <INVENTTRANSID>      CAP5637546_060</INVENTTRANSID>
        <QTYSALES>               6.0000000</QTYSALES>
        <QTYORDERED>               6.0000000</QTYORDERED>
        <QTYBACKORDERSALES>               6.0000000</QTYBACKORDERSALES>
        <QTYBACKORDERINVENT>               6.0000000</QTYBACKORDERINVENT>
        <SALESUNIT>EA</SALESUNIT>
        <ORIGSALESID>         CAP716197SO</ORIGSALESID>
        <DATAAREAID>wal</DATAAREAID>
        <RECID>622392609</RECID>
        <RecVersion>1</RecVersion>
    </Line>
</XML>

I can use XSLT 1 or 2

Regards,

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1 Answer

Editorial Team · Answer 1 · 2026-06-05T05:30:04+00:00

I. XSLT 1.0 solution:

Here is a solution using Muenchian grouping:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>

 <xsl:key name="kLineById" match="Line" use="ItemID|ITEMID"/>

 <xsl:template match="node()|@*">
     <xsl:copy>
       <xsl:apply-templates select="node()|@*"/>
     </xsl:copy>
 </xsl:template>

 <xsl:template match=
  "Line[not(generate-id() = generate-id(key('kLineById', ItemID|ITEMID)[1]))]"
  />
</xsl:stylesheet>

Do Note:

Muenchian grouping is the most efficient known general grouping method for XSLT 1.0.
Pure “push” style used.

II. XSLT 2.0 solution:

<xsl:stylesheet version="2.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output omit-xml-declaration="yes" indent="yes"/>

 <xsl:template match="/*">
     <XML>
       <xsl:for-each-group select="Line" group-by="ItemID | ITEMID">
         <xsl:sequence select="."/>
       </xsl:for-each-group>
     </XML>
 </xsl:template>
</xsl:stylesheet>

Both solutions, when applied on the provided XML document:

<XML>
        <Line>
            <SupplierID>Waltons</SupplierID>
            <InvoiceID>CAP600795SI</InvoiceID>
            <InvoiceDate>20100506</InvoiceDate>
            <ItemID>723073</ItemID>
            <ColorID>02</ColorID>
            <Description>Pentel LR7 Energel Metal Tip Refill 0.7mm</Description>
            <MainCategory>WRITING INSTRUMENTS</MainCategory>
            <SubCategory>Refill</SubCategory>
            <LineNum>               1.0000000</LineNum>
            <Qty>               6.0000000</Qty>
            <UnitPriceExclTax>              10.0200000</UnitPriceExclTax>
            <LineTax>               8.4200000</LineTax>
            <LinePriceExclTax>              60.1200000</LinePriceExclTax>
            <ColorName>Black</ColorName>
            <UOM>EA</UOM>
            <Backorder>               0.0000000</Backorder>
            <INVENTTRANSID>      CAP5637542_060</INVENTTRANSID>
        </Line>
        <Line>
            <SupplierID>Waltons</SupplierID>
            <InvoiceID>CAP600795SI</InvoiceID>
            <InvoiceDate>20100506</InvoiceDate>
            <ItemID>903420</ItemID>
            <ColorID />
            <Description>STEPHENS JUNIOR Stapler Half Strip KW586</Description>
            <MainCategory>OFFICE SUNDRIES</MainCategory>
            <SubCategory>Staplers</SubCategory>
            <LineNum>               2.0000000</LineNum>
            <Qty>               3.0000000</Qty>
            <UnitPriceExclTax>              32.2500000</UnitPriceExclTax>
            <LineTax>              13.5400000</LineTax>
            <LinePriceExclTax>              96.7500000</LinePriceExclTax>
            <ColorName />
            <UOM>Ea</UOM>
            <Backorder>               0.0000000</Backorder>
            <INVENTTRANSID>      CAP5637547_060</INVENTTRANSID>
        </Line>
        <Line>
            <SupplierID>Waltons</SupplierID>
            <InvoiceID>CAP600795SI</InvoiceID>
            <InvoiceDate>20100506</InvoiceDate>
            <ItemID>867241</ItemID>
            <ColorID />
            <Description>TRODAT PRINTY S/Inking Stamp Copy 4911</Description>
            <MainCategory>STAMPS DATERS NUMBERERS</MainCategory>
            <SubCategory>Self Inking Stamps</SubCategory>
            <LineNum>               3.0000000</LineNum>
            <Qty>               1.0000000</Qty>
            <UnitPriceExclTax>              42.1500000</UnitPriceExclTax>
            <LineTax>               5.9000000</LineTax>
            <LinePriceExclTax>              42.1500000</LinePriceExclTax>
            <ColorName />
            <UOM>Ea</UOM>
            <Backorder>               1.0000000</Backorder>
            <INVENTTRANSID>      CAP5637548_060</INVENTTRANSID>
        </Line>
        <Line>
            <SupplierID>Waltons</SupplierID>
            <InvoiceID>CAP600795SI</InvoiceID>
            <InvoiceDate>20100506</InvoiceDate>
            <ItemID>941151</ItemID>
            <ColorID />
            <Description>PENTEL Correction Tape 5mx5mm ZT35</Description>
            <MainCategory>OFFICE SUNDRIES</MainCategory>
            <SubCategory>Correction Fluid/Pens/Tape</SubCategory>
            <LineNum>               4.0000000</LineNum>
            <Qty>               2.0000000</Qty>
            <UnitPriceExclTax>              25.1500000</UnitPriceExclTax>
            <LineTax>               7.0400000</LineTax>
            <LinePriceExclTax>              50.3000000</LinePriceExclTax>
            <ColorName />
            <UOM>Ea</UOM>
            <Backorder>               0.0000000</Backorder>
            <INVENTTRANSID>      CAP5637549_060</INVENTTRANSID>
        </Line>
        <Line>
            <SupplierID>Waltons</SupplierID>
            <InvoiceID>CAP600795SI</InvoiceID>
            <InvoiceDate>20100506</InvoiceDate>
            <ItemID>801215</ItemID>
            <ColorID />
            <Description>MONDI ROTATRIM Copy Paper A4 80Gsm White</Description>
            <MainCategory>A4 Paper</MainCategory>
            <SubCategory>White Bond Paper</SubCategory>
            <LineNum>               5.0000000</LineNum>
            <Qty>             100.0000000</Qty>
            <UnitPriceExclTax>              29.0100000</UnitPriceExclTax>
            <LineTax>             406.1400000</LineTax>
            <LinePriceExclTax>            2901.0000000</LinePriceExclTax>
            <ColorName />
            <UOM>Pkt 500</UOM>
            <Backorder>               0.0000000</Backorder>
            <INVENTTRANSID>      CAP5637552_060</INVENTTRANSID>
        </Line>
        <Line>
            <SALESID>         CAP716197SO</SALESID>
            <INVOICEID>         CAP600795SI</INVOICEID>
            <INVOICEDATE>2010/05/06</INVOICEDATE>
            <NUMBERSEQUENCEGROUP />
            <LINENUM>               2.0000000</LINENUM>
            <ITEMID>805236</ITEMID>
            <INVENTDIMID>      CAP0000594_061</INVENTDIMID>
            <NAME>Ruled Paper A4 Fnt/Marg JD76</NAME>
            <CONFIRMEDDLV>2010/05/06</CONFIRMEDDLV>
            <INVENTTRANSID>      CAP5637543_060</INVENTTRANSID>
            <QTYSALES>               4.0000000</QTYSALES>
            <QTYORDERED>               4.0000000</QTYORDERED>
            <QTYBACKORDERSALES>               4.0000000</QTYBACKORDERSALES>
            <QTYBACKORDERINVENT>               4.0000000</QTYBACKORDERINVENT>
            <SALESUNIT>EA</SALESUNIT>
            <ORIGSALESID>         CAP716197SO</ORIGSALESID>
            <DATAAREAID>wal</DATAAREAID>
            <RECID>622392608</RECID>
            <RecVersion>1</RecVersion>
        </Line>
        <Line>
            <SALESID>         CAP716197SO</SALESID>
            <INVOICEID>         CAP600795SI</INVOICEID>
            <INVOICEDATE>2010/05/06</INVOICEDATE>
            <NUMBERSEQUENCEGROUP />
            <LINENUM>               3.0000000</LINENUM>
            <ITEMID>941150</ITEMID>
            <INVENTDIMID>      CAP0000594_061</INVENTDIMID>
            <NAME>PENGUIN Correction Fluid 20ml White</NAME>
            <CONFIRMEDDLV>2010/05/06</CONFIRMEDDLV>
            <INVENTTRANSID>      CAP5637546_060</INVENTTRANSID>
            <QTYSALES>               6.0000000</QTYSALES>
            <QTYORDERED>               6.0000000</QTYORDERED>
            <QTYBACKORDERSALES>               6.0000000</QTYBACKORDERSALES>
            <QTYBACKORDERINVENT>               6.0000000</QTYBACKORDERINVENT>
            <SALESUNIT>EA</SALESUNIT>
            <ORIGSALESID>         CAP716197SO</ORIGSALESID>
            <DATAAREAID>wal</DATAAREAID>
            <RECID>622392609</RECID>
            <RecVersion>1</RecVersion>
        </Line>
        <Line>
            <SALESID>         CAP716197SO</SALESID>
            <INVOICEID>         CAP600795SI</INVOICEID>
            <INVOICEDATE>2010/05/06</INVOICEDATE>
            <NUMBERSEQUENCEGROUP />
            <LINENUM>               5.0000000</LINENUM>
            <ITEMID>867241</ITEMID>
            <INVENTDIMID>      CAP0000594_061</INVENTDIMID>
            <NAME>TRODAT PRINTY S/Inking Stamp Copy 4911</NAME>
            <CONFIRMEDDLV>2010/05/06</CONFIRMEDDLV>
            <INVENTTRANSID>      CAP5637548_060</INVENTTRANSID>
            <QTYSALES>               2.0000000</QTYSALES>
            <QTYORDERED>               2.0000000</QTYORDERED>
            <QTYBACKORDERSALES>               1.0000000</QTYBACKORDERSALES>
            <QTYBACKORDERINVENT>               1.0000000</QTYBACKORDERINVENT>
            <SALESUNIT>EA</SALESUNIT>
            <ORIGSALESID>         CAP716197SO</ORIGSALESID>
            <DATAAREAID>wal</DATAAREAID>
            <RECID>622392610</RECID>
            <RecVersion>1</RecVersion>
        </Line>
</XML>

produce the wanted, correct result:

<XML>
   <Line>
            <SupplierID>Waltons</SupplierID>
            <InvoiceID>CAP600795SI</InvoiceID>
            <InvoiceDate>20100506</InvoiceDate>
            <ItemID>723073</ItemID>
            <ColorID>02</ColorID>
            <Description>Pentel LR7 Energel Metal Tip Refill 0.7mm</Description>
            <MainCategory>WRITING INSTRUMENTS</MainCategory>
            <SubCategory>Refill</SubCategory>
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            <ColorName>Black</ColorName>
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            <InvoiceDate>20100506</InvoiceDate>
            <ItemID>941151</ItemID>
            <ColorID/>
            <Description>PENTEL Correction Tape 5mx5mm ZT35</Description>
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            <InvoiceDate>20100506</InvoiceDate>
            <ItemID>801215</ItemID>
            <ColorID/>
            <Description>MONDI ROTATRIM Copy Paper A4 80Gsm White</Description>
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            <SubCategory>White Bond Paper</SubCategory>
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            <Qty>             100.0000000</Qty>
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            <NUMBERSEQUENCEGROUP/>
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            <ITEMID>805236</ITEMID>
            <INVENTDIMID>      CAP0000594_061</INVENTDIMID>
            <NAME>Ruled Paper A4 Fnt/Marg JD76</NAME>
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            <SALESUNIT>EA</SALESUNIT>
            <ORIGSALESID>         CAP716197SO</ORIGSALESID>
            <DATAAREAID>wal</DATAAREAID>
            <RECID>622392608</RECID>
            <RecVersion>1</RecVersion>
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            <NUMBERSEQUENCEGROUP/>
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            <ITEMID>941150</ITEMID>
            <INVENTDIMID>      CAP0000594_061</INVENTDIMID>
            <NAME>PENGUIN Correction Fluid 20ml White</NAME>
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            <QTYSALES>               6.0000000</QTYSALES>
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            <QTYBACKORDERINVENT>               6.0000000</QTYBACKORDERINVENT>
            <SALESUNIT>EA</SALESUNIT>
            <ORIGSALESID>         CAP716197SO</ORIGSALESID>
            <DATAAREAID>wal</DATAAREAID>
            <RECID>622392609</RECID>
            <RecVersion>1</RecVersion>
        </Line>
</XML>

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I need to eliminate duplicate elements from my XML using a specific node (ItemID)

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