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The self axis selects the context node

The unabbreviated syntax  for the selfaxis is as follows:  self::node()  The abbreviated syntax for the context node is the period character.  To select the value of the context node using the xsl:value-of element, you would write the following:  <xsl:value-of select="." />  The unabbreviated syntax is as follows: <xsl:value-of select="self::node()" />  File: Data.xml <?xml version = "1.0"?> <product>    <books>       <book>          C++       </book>       <book>Java</book>    </books> </product> File: Transform.xslt <?xml version = "1.0"?> <xsl:stylesheet version="1.0"   xmlns:xsl="http://www.w3.org/1999/XSL/Transform">   <xsl:template match="/product">     Self for     <xsl:apply-templates select="book" />   </xsl:template> </xsl:stylesheet> Output: <?xml version="1.0" encoding="UTF-8"?>     Self for