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Substring function with variable

File: Data.xml <test>   <color>red</color>   <color>blue</color>   <color>yellow</color> </test> File: Transform.xslt <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"   version="1.0">   <xsl:output omit-xml-declaration="yes" />   <xsl:variable name="fieldWidth">12</xsl:variable>   <xsl:template match="color">     <xsl:variable name="valueLength" select="string-length(.)" />     <xsl:variable name="padding" select="$fieldWidth - $valueLength" />     <xsl:value-of select="substring('                  ',1,$padding)" />     <xsl:value-of select="." />   </xsl:template> </xsl:stylesheet> Output:            red           blue         yellow