Ignoring nodes with duplicate data - xslt

Question

In the below xml, I would like to ignore the third node <Data1>12347</Data1> because I have to account for only the first unique occurrence of refCode. Since the first node value and third node value of refCode is 112233, I want to ignore the third node.
<?xml version="1.0" encoding="UTF-8"?>
<Example>
<Row>
<Data1>12345</Data1>
<Data2>
<DataRef>
<RefName>refCode</RefName>
<RefValue>112233</RefValue>
</DataRef>
<DataRef>
<RefName>SKU</RefName>
<RefValue>444-1112</RefValue>
</DataRef>
</Data2>
</Row>
<Row>
<Data1>12346</Data1>
<Data2>
<DataRef>
<RefName>refCode</RefName>
<RefValue>325325</RefValue>
</DataRef>
<DataRef>
<RefName>SKU</RefName>
<RefValue>444-1113</RefValue>
</DataRef>
</Data2>
</Row>
<Row>
<Data1>12347</Data1>
<Data2>
<DataRef>
<RefName>refCode</RefName>
<RefValue>112233</RefValue>
</DataRef>
<DataRef>
<RefName>SKU</RefName>
<RefValue>444-1114</RefValue>
</DataRef>
</Data2>
</Row>
</Example>

Answer 1

For XSLT-1.0 use an XSLT with a distinct value principle:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:key name="distinct" match="Row" use="Data2/DataRef/RefValue" />
<!-- identity template -->
<xsl:template match="node()|#*">
<xsl:copy>
<xsl:apply-templates select="node()|#*"/>
</xsl:copy>
</xsl:template>
<!-- matches unique Row elements -->
<xsl:template match="Row[generate-id(key('distinct',Data2/DataRef/RefValue)) = generate-id()]">
<xsl:copy-of select="."/>
</xsl:template>
<!-- ignores doublettes -->
<xsl:template match="Row" />
</xsl:stylesheet>