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Ancestor-or-self axis includes all nodes in the ancestor axis plus the context node (which is in the self axis)

File: Data.xml <?xml version="1.0" encoding="utf-8"?> <data>     <AAA id="a1" pos="start">       <BBB id="b1"/>       <BBB id="b2"/>     </AAA>     <AAA id="a2">       <BBB id="b3"/>       <BBB id="b4"/>       <CCC id="c1">         <CCC id="c2"/>       </CCC>       <BBB id="b5">         <CCC id="c3"/>       </BBB>     </AAA> </data> File: Transform.xslt <?xml version="1.0" encoding="utf-8"?> <xsl:stylesheet       version="1.0"       xmlns:xsl="http://www.w3.org/1999/XSL/Transform">     <xsl:template match="/">       <table border="1" cellpadding="6">         <xsl:for-each select="/source//*">           <xsl:call-template name="print"/>         </xsl:for-each>       </table>     </xsl:template>     <xsl:template name="print">           <xsl:value-of select="name()"/>           <xsl:text> id = </xsl:text>           <xsl:value-of select="./@id"/>           <xsl:for-each select="ancestor-or-self ::*">             <xsl:if test="not(@id)">               <xsl:value-of select="name()"/>             </xsl:if>             <xsl:value-of select="./@id"/>             <xsl:text/>           </xsl:for-each>     </xsl:template> </xsl:stylesheet>