Dear ALL,
I need some help on xsl:sequence. I'm using the Altova XSLT processor,
but I'm quite confident it is not an processor issue. It's probably my
bad knowledge of xslt 2.0.
I have probably put more that required in the test case, but it
basically covers my more complex code.

Here is the xml example source:
<?xml version="1.0" encoding="UTF-8"?>
<SeqTest>
	<Item>otto_L</Item>
	<Item>otto_L</Item>
	<Item>otto_R</Item>
	<Item>otto_L</Item>
	<Item>karl_L</Item>
	<Item>karl_R</Item>
	<Item>nepumuk_L</Item>
</SeqTest>
My xslt
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
	xmlns:xs="http://www.w3.org/2001/XMLSchema"  >
	<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/
>
	<xsl:template match="/">
		<DEBUG>
			<xsl:for-each select="SeqTest/Item">
				<ForeEach Pos="{position()}" Name="{.}"/>
			</xsl:for-each>
			<xsl:variable name="vSeq">
				<xsl:for-each-group select="SeqTest/Item"
					group-by="substring(.,1,string-length(.)-2)">
					<xsl:variable name="vBaseName" s
					elect="substring(.,1,string-length(.)-2)"/>
					<xsl:if test="$vBaseName != 'nepumuk'">
						<xsl:sequence select="$vBaseName"/>
					</xsl:if>
				</xsl:for-each-group>
			</xsl:variable>
			<Seq>
				<xsl:for-each select="$vSeq">
					<Item BaseName="{.}"/>
				</xsl:for-each>
			</Seq>
		</DEBUG>
	</xsl:template>
</xsl:stylesheet>
The UNEXPECTED result
<?xml version="1.0" encoding="UTF-8"?>
<DEBUG xmlns:xs="http://www.w3.org/2001/XMLSchema">
	<ForeEach Pos="1" Name="otto_L"/>
	<ForeEach Pos="2" Name="otto_L"/>
	<ForeEach Pos="3" Name="otto_R"/>
	<ForeEach Pos="4" Name="otto_L"/>
	<ForeEach Pos="5" Name="karl_L"/>
	<ForeEach Pos="6" Name="karl_R"/>
	<ForeEach Pos="7" Name="nepumuk_L"/>
	<Seq>
		<Item BaseName="ottokarl"/>
	</Seq>
</DEBUG>

As you can see the result element Item is only once there.
For me it meas that I have not build a sequnce of simple string values
over which I want to iterate.
(Please see attribute BaseName="otokarl" which indictes that too )

WHAT IS WRONG HERE ?

Any help is welcome

Rolf