[xsl] Lookup, eliminating duplicates and sorting

["Manfred Staudinger" <manfred.staudinger@xxxxxxxxx>]

Hi list,
xslt 1.0 - I've a set of nodes, for which I want
a. to replace some values (most will not change), then
b. eliminate the duplicates and sort them.
Sample input xml:
<?xml version="1.0" encoding="UTF-8" ?>
<a>
	<e1>
		<b>abc</b>
		<b>abd</b>
		<b>abe</b>
		<b>abf</b>
		<b>abg</b>
		<b>abh</b>
		<b>abd</b>
	</e1>
	<e2>
		<f c="abe" b1="abc"/>
		<f c="abf" b1="abj"/>
		<f c="abg" b1="abi"/>
		<f c="abh" b1="abi"/>
	</e2>
</a>
The input table _e1_ will be transformed using _f_ to
  <e1>
     <b>abc</b>
     <b>abd</b>
     <b>abc</b>
     <b>abj</b>
     <b>abi</b>
     <b>abi</b>
     <b>abd</b>
  </e1>
and finally should become
=== what I would like to have ===
	<e3>
		<b2>abc</b2>
		<b2>abd</b2>
		<b2>abi</b2>
		<b2>abj</b2>
	</e3>
The text nodes represent URI's and are then used to
create html links. So far I was only able to write in
2 different task what should be done in one:

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="xml" indent="yes" />

<xsl:template match="node() | @*">
	<xsl:copy>
		<xsl:apply-templates select="node() | @*"/>
	</xsl:copy>
</xsl:template>
<xsl:key name="dupl" match="b" use="."/>
<xsl:template match="e1">
	<xsl:copy>
		<xsl:for-each select="b[count(self::b|key('dupl',self::b)[1])=1]">
			<xsl:sort select="."/>
			<b><xsl:value-of select="."/></b>
		</xsl:for-each>
	</xsl:copy>
</xsl:template>
<xsl:template match="e2"/>
<xsl:template match="e3"/>

<xsl:template match="node() | @*" mode="trans">
	<xsl:copy>
		<xsl:apply-templates select="node() | @*" mode="trans"/>
	</xsl:copy>
</xsl:template>
<xsl:key name="trans" match="f" use="@c"/>
<xsl:template match="e1" mode="trans">
	<xsl:copy>
		<xsl:for-each select="b">
			<xsl:choose>
				<xsl:when test="key('trans', .)/@b1">
					<b><xsl:value-of select="key('trans', .)/@b1"/></b>
				</xsl:when>
				<xsl:otherwise>
					<b><xsl:value-of select="."/></b>
				</xsl:otherwise>
			</xsl:choose>
		</xsl:for-each>
	</xsl:copy>
</xsl:template>
<xsl:template match="e2" mode="trans"/>
<xsl:template match="e3" mode="trans"/>

<xsl:template match="/">
	<xsl:apply-templates mode="trans"/>
	<xsl:apply-templates/>
</xsl:template>
</xsl:stylesheet>

Many thanks in advance,
Manfred