Storing into a variable and displaying the unique entries using XSL - xslt

Question

In that, I want to display only the unique fruit entries in it. Here is the XML tag what I'm using for parsing
<main>
<local id="1" type="Primary">
-<summary Date="23-02-12">
-<fruit>apple</fruit>
-<fruit>Orange</fruit>
</summary>
</local>
<local id="2" type="Primary">
-<summary Date="23-02-12">
-<fruit>apple</fruit>
-<fruit>mango</fruit>
</summary>
</local>
</main>
The expected result should be in the below format
<fruit>apple</fruit>
<fruit>Orange</fruit>
<fruit>Mango</fruit>
Here are the code snippet what I'm trying to use
<xsl:for-each select="main/local">
<xsl:for-each select="symbol/fruit">
<xsl:copy-of select="."/>
<xsl:copy-of select="fruit[not(.=$fruit)]"/>
</xsl:for-each>
</xsl:for-each>
But I'm not getting any output display for this, Can you please help me how can I remove this duplicate redundancy from here.? Thank You in advance

Answer 1

To do this in XSLT1.0 you can make use of a technique called 'Meunchian' grouping. First you define a key to 'look-up' the fruit elements based on the value
<xsl:key name="fruit" match="fruit" use="." />
Then, to get the unique fruit names, you match fruit elements that happen to be the first fruit element in the key (and to check two nodes are the same the generate-id() method is used)
<xsl:apply-templates
select="//fruit[generate-id() = generate-id(key('fruit', .)[1])]" />
Here is the full XSLT
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:key name="fruit" match="fruit" use="." />
<xsl:template match="/">
<xsl:apply-templates
select="//fruit[generate-id() = generate-id(key('fruit', .)[1])]" />
</xsl:template>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
When applied to your sample XML, the following is output:
<fruit>apple</fruit>
<fruit>Orange</fruit>
<fruit>mango</fruit>