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POXSLT filter duplicates in result
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  1. POXSLT filter duplicates in result
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    copied!<p>I"m trying to figure out how to avoid duplicates in the result set when applying XSLT transformation (I'm using XSLT 1.0)</p> <p>Here's XML source:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?&gt; &lt;?xml-stylesheet type="text/xsl" href="1.xsl"?&gt; &lt;root&gt; &lt;item&gt; &lt;code&gt;AA&lt;/code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;YY&lt;/included-code&gt; &lt;included-code&gt;WW&lt;/included-code&gt; &lt;/item&gt; &lt;item&gt; &lt;code&gt;BB&lt;/code&gt; &lt;included-code&gt;ZZ&lt;/included-code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;YY&lt;/included-code&gt; &lt;/item&gt; &lt;item&gt; &lt;code&gt;CC&lt;/code&gt; &lt;included-code&gt;VV&lt;/included-code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;WW&lt;/included-code&gt; &lt;/item&gt; &lt;/root&gt; </code></pre> <p>Here's stylesheet:</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:template match="/"&gt; &lt;result&gt; &lt;xsl:apply-templates/&gt; &lt;/result&gt; &lt;/xsl:template&gt; &lt;xsl:template match="item"&gt; &lt;new-item&gt; &lt;code&gt;&lt;xsl:value-of select="code"/&gt;&lt;/code&gt; &lt;xsl:variable name="main_code"&gt;&lt;xsl:value-of select="code"/&gt;&lt;/xsl:variable&gt; &lt;xsl:for-each select="included-code"&gt; &lt;xsl:variable name="current_code"&gt;&lt;xsl:value-of select="text()"/&gt;&lt;/xsl:variable&gt; &lt;included-code&gt;&lt;xsl:value-of select="$current_code"/&gt;&lt;/included-code&gt; &lt;xsl:for-each select="/root/item[included-code=$current_code and code!=$main_code]"&gt; &lt;included-code&gt;&lt;xsl:value-of select="code"/&gt;&lt;/included-code&gt; &lt;/xsl:for-each&gt; &lt;/xsl:for-each&gt; &lt;/new-item&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>Here's the result:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;&lt;result&gt; &lt;new-item&gt; &lt;code&gt;AA&lt;/code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;BB&lt;/included-code&gt; &lt;included-code&gt;CC&lt;/included-code&gt; &lt;included-code&gt;YY&lt;/included-code&gt; &lt;included-code&gt;BB&lt;/included-code&gt; &lt;included-code&gt;WW&lt;/included-code&gt; &lt;included-code&gt;CC&lt;/included-code&gt; &lt;/new-item&gt; &lt;new-item&gt; &lt;code&gt;BB&lt;/code&gt; &lt;included-code&gt;ZZ&lt;/included-code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;AA&lt;/included-code&gt; &lt;included-code&gt;CC&lt;/included-code&gt; &lt;included-code&gt;YY&lt;/included-code&gt; &lt;included-code&gt;AA&lt;/included-code&gt; &lt;/new-item&gt; &lt;new-item&gt; &lt;code&gt;CC&lt;/code&gt; &lt;included-code&gt;VV&lt;/included-code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;AA&lt;/included-code&gt; &lt;included-code&gt;BB&lt;/included-code&gt; &lt;included-code&gt;WW&lt;/included-code&gt; &lt;included-code&gt;AA&lt;/included-code&gt; &lt;/new-item&gt; &lt;/result&gt; </code></pre> <p>The question is - how to avoid with duplicate values in the result. I.e. here's what expected:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;&lt;result&gt; &lt;new-item&gt; &lt;code&gt;AA&lt;/code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;BB&lt;/included-code&gt; &lt;included-code&gt;CC&lt;/included-code&gt; &lt;included-code&gt;YY&lt;/included-code&gt; &lt;included-code&gt;WW&lt;/included-code&gt; &lt;/new-item&gt; &lt;new-item&gt; &lt;code&gt;BB&lt;/code&gt; &lt;included-code&gt;ZZ&lt;/included-code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;AA&lt;/included-code&gt; &lt;included-code&gt;CC&lt;/included-code&gt; &lt;included-code&gt;YY&lt;/included-code&gt; &lt;/new-item&gt; &lt;new-item&gt; &lt;code&gt;CC&lt;/code&gt; &lt;included-code&gt;VV&lt;/included-code&gt; &lt;included-code&gt;XX&lt;/included-code&gt; &lt;included-code&gt;AA&lt;/included-code&gt; &lt;included-code&gt;BB&lt;/included-code&gt; &lt;included-code&gt;WW&lt;/included-code&gt; &lt;/new-item&gt; &lt;/result&gt; </code></pre> <hr> <p>Thanks LarsH! Looks like the following script does the trick: (I'm relatively new to XSLT, so not sure if there's more elegant way to keep list of already outputted values)</p> <pre><code>&lt;?xml version="1.0"?&gt; &lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:template match="/"&gt; &lt;result&gt; &lt;xsl:apply-templates/&gt; &lt;/result&gt; &lt;/xsl:template&gt; &lt;xsl:template match="item"&gt; &lt;new-item&gt; &lt;code&gt;&lt;xsl:value-of select="code"/&gt;&lt;/code&gt; &lt;xsl:variable name="main_code"&gt;&lt;xsl:value-of select="code"/&gt;&lt;/xsl:variable&gt; &lt;xsl:call-template name="processIncludedCodes"&gt; &lt;xsl:with-param name="main_code" select="./code"/&gt; &lt;xsl:with-param name="codes" select="./included-code"/&gt; &lt;/xsl:call-template&gt; &lt;/new-item&gt; &lt;/xsl:template&gt; &lt;xsl:template name="processIncludedCodes"&gt; &lt;xsl:param name="main_code"/&gt; &lt;xsl:param name="codes"/&gt; &lt;xsl:param name="outputCodes"/&gt; &lt;xsl:if test="$codes"&gt; &lt;xsl:variable name="current_code"&gt;&lt;xsl:value-of select="$codes[1]"/&gt;&lt;/xsl:variable&gt; &lt;xsl:variable name="outputCode" select="concat(':', $codes[1], ':')"/&gt; &lt;xsl:if test="not(contains($outputCodes, $outputCode))"&gt; &lt;included-code&gt;&lt;xsl:value-of select="$codes[1]"/&gt;&lt;/included-code&gt; &lt;/xsl:if&gt; &lt;xsl:for-each select="/root/item[included-code=$current_code and code!=$main_code]"&gt; &lt;xsl:if test="not(contains($outputCodes, ./code))"&gt; &lt;included-code&gt;&lt;xsl:value-of select="code"/&gt;&lt;/included-code&gt; &lt;/xsl:if&gt; &lt;/xsl:for-each&gt; &lt;xsl:variable name="outputCodes2"&gt; &lt;xsl:for-each select="/root/item[included-code=$current_code and code!=$main_code]"&gt; &lt;xsl:value-of select="concat(':', code, ':')"/&gt; &lt;/xsl:for-each&gt; &lt;/xsl:variable&gt; &lt;xsl:variable name="newOutputCodes" select="concat($outputCodes, $outputCode, $outputCodes2)"/&gt; &lt;xsl:call-template name="processIncludedCodes"&gt; &lt;xsl:with-param name="main_code" select="$main_code"/&gt; &lt;xsl:with-param name="codes" select="$codes[position() &gt; 1]"/&gt; &lt;xsl:with-param name="outputCodes" select="$newOutputCodes"/&gt; &lt;/xsl:call-template&gt; &lt;/xsl:if&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre>
 

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