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    copied!<p><code>ancestor</code> is for selecting nodes that are higher (closer to the root) in the XML document. <code>descendant</code> is for selecting nodes that are lower (children) in the XML document.</p> <p>In your example, <code>ancestor::criterion</code> selects nothing because the current node is <code>/</code> (meaning the root of the document - <code>&lt;file&gt;</code> in this case), as indicated by <code>match="/"</code>. The root node has no ancestors so the <code>ancestor</code> axis does nothing.</p> <p>To get every <code>&lt;criterion&gt;</code> element, you should use the <code>descendant</code> axis:</p> <pre><code>&lt;xsl:template match="/"&gt; &lt;xsl:copy-of select="descendant::criterion"/&gt; &lt;/xsl:template&gt; </code></pre> <p>Or its shortcut <code>//</code>:</p> <pre><code>&lt;xsl:template match="/"&gt; &lt;xsl:copy-of select="//criterion"/&gt; &lt;/xsl:template&gt; </code></pre> <p>That will return the following: </p> <pre><code>&lt;criterion&gt;AAA&lt;/criterion&gt; </code></pre> <p>Using a loop or another template you can get all three of them:</p> <pre><code>&lt;xsl:template match="/"&gt; &lt;file&gt; &lt;xsl:apply-templates select="//criterion"/&gt; &lt;/file&gt; &lt;/xsl:template&gt; &lt;xsl:template match="criterion"&gt; &lt;xsl:copy-of select="."/&gt; &lt;/xsl:template&gt; </code></pre> <p>This will produce the following:</p> <pre><code>&lt;file&gt; &lt;criterion&gt;AAA&lt;/criterion&gt; &lt;criterion&gt;BBB&lt;/criterion&gt; &lt;criterion&gt;CCC&lt;/criterion&gt; &lt;/file&gt; </code></pre> <p>If you want to get the <code>&lt;file&gt;</code> element, too, it's a bit more complicated. XPath specifies nodes and simple copies will not copy the elements that contain the elements you select. I can clarify this point more if you're still confused.</p>
 

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