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    <p>To do this, you can define a variable to hold the look-up data</p> <pre><code>&lt;xsl:variable name="lookup" select="document('Lookup.xml')/lookup"/&gt; </code></pre> <p>And then you can look-up the quantity for a particular Line-Item like so (In this case, the XSLT is currently positioned on a Quantity element within a Line-Item)</p> <pre><code>&lt;xsl:variable name="quantity" select="$lookup//Code[LookupID = current()/../ID]/LookupQuantity"/&gt; </code></pre> <p>If nothing was returned by this variable, then you know the element was not in the look-up</p> <p>Here is the full XSLT</p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:variable name="lookup" select="document('Lookup.xml')/lookup"/&gt; &lt;xsl:template match="@*|node()"&gt; &lt;xsl:copy&gt; &lt;xsl:apply-templates select="@*|node()"/&gt; &lt;/xsl:copy&gt; &lt;/xsl:template&gt; &lt;xsl:template match="Line-Item/Quantity"&gt; &lt;xsl:variable name="quantity" select="$lookup//Code[LookupID = current()/../ID]/LookupQuantity"/&gt; &lt;Quantity&gt; &lt;xsl:choose&gt; &lt;xsl:when test="number($quantity) = number($quantity)"&gt; &lt;xsl:value-of select="number(.) div number($quantity)"/&gt; &lt;/xsl:when&gt; &lt;xsl:otherwise&gt; &lt;xsl:value-of select="."/&gt; &lt;/xsl:otherwise&gt; &lt;/xsl:choose&gt; &lt;/Quantity&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p>When applied to your sample XML, the following is output</p> <pre><code>&lt;document&gt; &lt;Line&gt; &lt;Line-Item&gt; &lt;ID&gt;5&lt;/ID&gt; &lt;Quantity&gt;4&lt;/Quantity&gt; &lt;/Line-Item&gt; &lt;/Line&gt; &lt;Line&gt; &lt;Line-Item&gt; &lt;ID&gt;6&lt;/ID&gt; &lt;Quantity&gt;3&lt;/Quantity&gt; &lt;/Line-Item&gt; &lt;/Line&gt; &lt;Line&gt; &lt;Line-Item&gt; &lt;ID&gt;60&lt;/ID&gt; &lt;Quantity&gt;3020&lt;/Quantity&gt; &lt;/Line-Item&gt; &lt;/Line&gt; &lt;/document&gt; </code></pre>
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    1. COthanks for your answer!
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