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    <p>You can use a <em>composite key</em> to collect the cars by brand, type and color:</p> <pre><code>&lt;xsl:output indent="yes"/&gt; &lt;xsl:key name="k_cars" match="/products/cars/car/attribs/attrib" use="concat(../../brand,../../type,color)"/&gt; </code></pre> <p>Then iterate on <code>cars/car</code> and, because you need to check the price for all colors (some car may miss a color), sub-iterate on <code>colors/color</code> and use <code>xsl:choose</code> testing on the key. If the key returns a node, then print corresponding price; otherwise print <code>-</code>:</p> <pre><code>&lt;xsl:variable name="car" select="."/&gt; &lt;xsl:for-each select="/products/colors/*"&gt; &lt;xsl:variable name="v_CarColor" select="key('k_cars',concat($car/brand,$car/type,id))"/&gt; &lt;xsl:choose&gt; &lt;xsl:when test="$v_CarColor"&gt; &lt;ss:Cell&gt; &lt;ss:Data ss:Type="String"&gt; &lt;xsl:value-of select="$v_CarColor/price"/&gt; &lt;/ss:Data&gt; &lt;/ss:Cell&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;ss:Cell&gt; &lt;ss:Data ss:Type="String"&gt;-&lt;/ss:Data&gt; &lt;/ss:Cell&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/xsl:for-each&gt; </code></pre> <hr> <p>Your final transform:</p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:ss="excel.xml"&gt; &lt;xsl:output indent="yes"/&gt; &lt;xsl:key name="k_cars" match="/products/cars/car/attribs/attrib" use="concat(../../brand,../../type,color)"/&gt; &lt;xsl:template match="/products"&gt; &lt;ss:Table&gt; &lt;ss:Row&gt; &lt;!-- This is the header row --&gt; &lt;ss:Cell&gt; &lt;ss:Data ss:Type="String"&gt;Brand / Model&lt;/ss:Data&gt; &lt;/ss:Cell&gt; &lt;xsl:for-each select="colors/color"&gt; &lt;ss:Cell&gt; &lt;ss:Data ss:Type="String"&gt; &lt;xsl:value-of select="id"/&gt;/&lt;xsl:value-of select="shortdesc"/&gt; &lt;/ss:Data&gt; &lt;/ss:Cell&gt; &lt;/xsl:for-each&gt; &lt;/ss:Row&gt; &lt;xsl:for-each select="cars/car"&gt; &lt;ss:Row&gt; &lt;ss:Cell&gt; &lt;ss:Data ss:Type="String"&gt; &lt;xsl:value-of select="brand"/&gt; &lt;xsl:value-of select="type"/&gt; &lt;/ss:Data&gt; &lt;/ss:Cell&gt; &lt;xsl:variable name="car" select="."/&gt; &lt;xsl:for-each select="/products/colors/*"&gt; &lt;xsl:variable name="v_CarColor" select="key('k_cars',concat($car/brand,$car/type,id))"/&gt; &lt;xsl:choose&gt; &lt;xsl:when test="$v_CarColor"&gt; &lt;ss:Cell&gt; &lt;ss:Data ss:Type="String"&gt; &lt;xsl:value-of select="$v_CarColor/price"/&gt; &lt;/ss:Data&gt; &lt;/ss:Cell&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;ss:Cell&gt; &lt;ss:Data ss:Type="String"&gt;-&lt;/ss:Data&gt; &lt;/ss:Cell&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/xsl:for-each&gt; &lt;/ss:Row&gt; &lt;/xsl:for-each&gt; &lt;/ss:Table&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre>
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    1. COMy xsl is a bit more complicated but with your clear example, you point me to the right direction. That xsl:key is very powerful! Thanks a lot.
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