Без комментариев, собственно вот шаблон XSL:
<xsl:template name="ConvertDecToHex">
<xsl:param name="index" />
<xsl:if test="$index > 0">
<xsl:call-template name="ConvertDecToHex">
<xsl:with-param name="index" select="floor($index div 16)" />
</xsl:call-template>
<xsl:choose>
<xsl:when test="$index mod 16 < 10">
<xsl:value-of select="$index mod 16" />
</xsl:when>
<xsl:otherwise>
<xsl:choose>
<xsl:when test="$index mod 16 = 10">A</xsl:when>
<xsl:when test="$index mod 16 = 11">B</xsl:when>
<xsl:when test="$index mod 16 = 12">C</xsl:when>
<xsl:when test="$index mod 16 = 13">D</xsl:when>
<xsl:when test="$index mod 16 = 14">E</xsl:when>
<xsl:when test="$index mod 16 = 15">F</xsl:when>
<xsl:otherwise>A</xsl:otherwise>
</xsl:choose>
</xsl:otherwise>
</xsl:choose>
</xsl:if>
</xsl:template>* This source code was highlighted with Source Code Highlighter.
И вот, как его использовать:
<xsl:call-template name="ConvertDecToHex">
<xsl:with-param name="index">15</xsl:with-param>
</xsl:call-template>* This source code was highlighted with Source Code Highlighter.
На выходе получим F.