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    copied!<p><strong>Here is a more efficient solution, using the classical Muenchian method for grouping -- with keys</strong>.</p> <p><strong>This transformation</strong>:</p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output omit-xml-declaration="yes" indent="yes"/&gt; &lt;xsl:variable name="vLower" select= "'abcdefghijklmnopqrstuvwxyz'"/&gt; &lt;xsl:variable name="vUpper" select= "'ABCDEFGHIJKLMNOPQRSTUVWXYZ'"/&gt; &lt;xsl:key name="kTitleBy1stLetter" match="database" use="substring(title_display,1,1)"/&gt; &lt;xsl:template match="/*"&gt; &lt;xsl:for-each select= "database [generate-id() = generate-id(key('kTitleBy1stLetter', substring(title_display,1,1) )[1] ) ]" &gt; &lt;xsl:variable name="v1st" select="substring(title_display,1,1)"/&gt; &lt;h2&gt;&lt;xsl:value-of select="$v1st"/&gt;&lt;/h2&gt; &lt;div class="{translate($v1st, $vUpper, $vLower)}-content"&gt; &lt;ul&gt; &lt;xsl:for-each select= "key('kTitleBy1stLetter',$v1st)"&gt; &lt;li&gt;&lt;xsl:value-of select="title_display"/&gt;&lt;/li&gt; &lt;/xsl:for-each&gt; &lt;/ul&gt; &lt;/div&gt; &lt;/xsl:for-each&gt; &lt;/xsl:template&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p><strong>When applied on the originally provided XML document</strong>:</p> <pre><code>&lt;databases&gt; &lt;database&gt; &lt;title_display&gt;Aardvark&lt;/title_display&gt; &lt;/database&gt; &lt;database&gt; &lt;title_display&gt;Apple&lt;/title_display&gt; &lt;/database&gt; &lt;database&gt; &lt;title_display&gt;Blue&lt;/title_display&gt; &lt;/database&gt; &lt;database&gt; &lt;title_display&gt;Car&lt;/title_display&gt; &lt;/database&gt; &lt;/databases&gt; </code></pre> <p><strong>produces exactly the wanted result</strong>:</p> <pre><code>&lt;h2&gt;A&lt;/h2&gt; &lt;div class="a-content"&gt; &lt;ul&gt; &lt;li&gt;Aardvark&lt;/li&gt; &lt;li&gt;Apple&lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;h2&gt;B&lt;/h2&gt; &lt;div class="b-content"&gt; &lt;ul&gt; &lt;li&gt;Blue&lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;h2&gt;C&lt;/h2&gt; &lt;div class="c-content"&gt; &lt;ul&gt; &lt;li&gt;Car&lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; </code></pre> <p><strong>Do note, that the Muenchian method is hugely more efficient than the O(N^2) solution</strong> that uses comparison of all <code>database</code> elements on the <code>preceding-sibling::</code> axis.</p> <p><strong>Also, this solution produces the <code>class</code> attributes value with the required capitalization</strong>.</p>
 

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