Symphony.

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  
<!--
	ISO-8859-1 based URL-encoding demo
	Written by Mike J. Brown, mike@skew.org.
	Updated 2002-05-20.

	No license; use freely, but credit me if reproducing in print.

	Also see http://skew.org/xml/misc/URI-i18n/ for a discussion of
	non-ASCII characters in URIs.

	Usage:

	<xsl:call-template name="decode">
		<xsl:with-param name="str" select="$url"/>
	</xsl:call-template>

	<xsl:call-template name="encode">
		<xsl:with-param name="str" select="$url"/>
	</xsl:call-template>

-->

	<xsl:variable name="hex" select="'0123456789ABCDEF'"/>
	<xsl:variable name="ascii"> !"#$%&amp;'()*+,-./0123456789:;&lt;=&gt;?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~</xsl:variable>
	<xsl:variable name="safe">!'()*-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~</xsl:variable>
	<xsl:variable name="latin1">&#160;&#161;&#162;&#163;&#164;&#165;&#166;&#167;&#168;&#169;&#170;&#171;&#172;&#173;&#174;&#175;&#176;&#177;&#178;&#179;&#180;&#181;&#182;&#183;&#184;&#185;&#186;&#187;&#188;&#189;&#190;&#191;&#192;&#193;&#194;&#195;&#196;&#197;&#198;&#199;&#200;&#201;&#202;&#203;&#204;&#205;&#206;&#207;&#208;&#209;&#210;&#211;&#212;&#213;&#214;&#215;&#216;&#217;&#218;&#219;&#220;&#221;&#222;&#223;&#224;&#225;&#226;&#227;&#228;&#229;&#230;&#231;&#232;&#233;&#234;&#235;&#236;&#237;&#238;&#239;&#240;&#241;&#242;&#243;&#244;&#245;&#246;&#247;&#248;&#249;&#250;&#251;&#252;&#253;&#254;&#255;</xsl:variable>

	<xsl:template name="decode">
		<xsl:param name="str"/>

		<xsl:choose>
			<xsl:when test="contains($str,'%')">
				<xsl:value-of select="substring-before($str,'%')"/>
				<xsl:variable name="hexpair" select="translate(substring(substring-after($str,'%'),1,2),'abcdef','ABCDEF')"/>
				<xsl:variable name="decimal" select="(string-length(substring-before($hex,substring($hexpair,1,1))))*16 + string-length(substring-before($hex,substring($hexpair,2,1)))"/>
				<xsl:choose>
					<xsl:when test="$decimal &lt; 127 and $decimal &gt; 31">
						<xsl:value-of select="substring($ascii,$decimal - 31,1)"/>
					</xsl:when>
					<xsl:when test="$decimal &gt; 159">
						<xsl:value-of select="substring($latin1,$decimal - 159,1)"/>
					</xsl:when>
					<xsl:otherwise>?</xsl:otherwise>
				</xsl:choose>
				<xsl:call-template name="decode">
					<xsl:with-param name="str" select="substring(substring-after($str,'%'),3)"/>
				</xsl:call-template>
			</xsl:when>
			<xsl:otherwise>
				<xsl:value-of select="$str"/>
			</xsl:otherwise>
		</xsl:choose>
	</xsl:template>


	<xsl:template name="url-encode">
		<xsl:param name="str"/>   
		<xsl:if test="$str">
			<xsl:variable name="first-char" select="substring($str,1,1)"/>
			<xsl:choose>
				<xsl:when test="contains($safe,$first-char)">
					<xsl:value-of select="$first-char"/>
				</xsl:when>
				<xsl:otherwise>
					<xsl:variable name="codepoint">
						<xsl:choose>
							<xsl:when test="contains($ascii,$first-char)">
								<xsl:value-of select="string-length(substring-before($ascii,$first-char)) + 32"/>
							</xsl:when>
							<xsl:when test="contains($latin1,$first-char)">
								<xsl:value-of select="string-length(substring-before($latin1,$first-char)) + 160"/>
							</xsl:when>
							<xsl:otherwise>
								<xsl:message terminate="no">Warning: string contains a character that is out of range! Substituting "?".</xsl:message>
								<xsl:text>63</xsl:text>
							</xsl:otherwise>
						</xsl:choose>
					</xsl:variable>
					<xsl:variable name="hex-digit1" select="substring($hex,floor($codepoint div 16) + 1,1)"/>
					<xsl:variable name="hex-digit2" select="substring($hex,$codepoint mod 16 + 1,1)"/>
					<xsl:value-of select="concat('%',$hex-digit1,$hex-digit2)"/>
				</xsl:otherwise>
			</xsl:choose>
			<xsl:if test="string-length($str) &gt; 1">
				<xsl:call-template name="url-encode">
					<xsl:with-param name="str" select="substring($str,2)"/>
				</xsl:call-template>
			</xsl:if>
		</xsl:if>
	</xsl:template>

</xsl:stylesheet>