tag-cloud.xsl

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:math="http://exslt.org/math" extension-element-prefixes="math">

<xsl:template match="data">

	<xsl:call-template name="tag-cloud">
		<xsl:with-param name="range" select="'5'"/>
		<xsl:with-param name="tags" select="section-schema[@handle='articles']/*[name()='tags']//option"/>
	</xsl:call-template>
	
</xsl:template>

<xsl:template name="tag-cloud">
	<xsl:param name="range" select="'1'"/>
	<xsl:param name="tags"/>

	<xsl:variable name="constant" select="(math:max($tags/@count) div $range)" />

	<ul>
		<xsl:for-each select="$tags">
			<li class="size-{ceiling(@count div $constant)}">
				<a href="/tags/{@handle}/">
					<xsl:value-of select="." />
				</a>
			</li>
		</xsl:for-each>
	</ul>

</xsl:template>
	
</xsl:stylesheet>