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

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