Write a code using XSL for nested for-each

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
   <xsl:template match="/">
      <Order>
         <xsl:copy-of select="Order/@*"/>
         <xsl:copy-of select="Order/Extn"/>
         <OrderLines>
            <xsl:for-each select="Order/OrderLines/OrderLine">
               <OrderLine>
                  <xsl:copy-of select="@*"/>
                  
                  <Extn IsNew="Y">
                  	 <xsl:for-each select = "DeliveryMethod!='SHP'">
                  	 	
                  	 <xsl:variable name="varColor">
                        <xsl:value-of select="'Purple'"/>
                     </xsl:variable>
                    <xsl:attribute name="Color">
                        <xsl:value-of select="$varColor"/>
                     </xsl:attribute>
                	</xsl:for-each>
                  </Extn>

<?xml-stylesheet type="text/xsl" href="order.xsl"?>
<Order DocumentType="0001" EnterpriseCode="Test" OrderNo="pv14852258797">
   <OrderLines>
      <OrderLine CarrierServiceCode="FEDEX" DeliveryMethod="SHP" GiftFlag="N" OrderedQty="1" PrimeLineNo="1" SCAC="92" SubLineNo="1">
      </OrderLine>
      <OrderLine CarrierServiceCode="USPS" DeliveryMethod="PICK" GiftFlag="N" OrderedQty="1" PrimeLineNo="2" SCAC="92" SubLineNo="2">
      </OrderLine>
      </OrderLines>
</Order>