Hi Mike!
No, sorry, this information is not sent to the trace listener. The select expression on the xsl:value-of instruction should be available, but not its result. 
Is there a possibility to get this in a newer version?

And now an other problem:

I have a script, that works well if have not added a TraceListener, but throws an exception if I have added one (My listener, but there is the same exception with the XSLTTraceListener e.g.).

I have added the trace, the script and the source

--- trace ---

java.lang.AssertionError: Incestuous relationship!
    at net.sf.saxon.expr.ComputedExpression.setParentExpression(ComputedExpression.java:67)
    at net.sf.saxon.style.XSLChoose.compile(XSLChoose.java:136)
    at net.sf.saxon.style.StyleElement.compileSequenceConstructor(StyleElement.java:1368)
    at net.sf.saxon.style.XSLTemplate.compile(XSLTemplate.java:244)
    at net.sf.saxon.style.XSLStylesheet.compileStylesheet(XSLStylesheet.java:938)
    at net.sf.saxon.PreparedStylesheet.setStylesheetDocument(PreparedStylesheet.java:290)
    at net.sf.saxon.PreparedStylesheet.prepare(PreparedStylesheet.java:112)
    at net.sf.saxon.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:124)
    at net.sf.saxon.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:79)
...

--- script ---

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
  <xsl:output method="xml" encoding="ISO-8859-1"/>
  <xsl:template match="CsvRootTag">
    <AmsStammdaten>
      <xsl:for-each select="Csv[A1='{']">
        <!--following-sibling::Csv[generate-id(preceding-sibling::Csv[A1='{'][1]) =  generate-id(current())]-->
        <xsl:variable name="artikel" select="following-sibling::Csv[generate-id(preceding-sibling::Csv[A1='{'][1]) =  generate-id(current())]"/>
        <xsl:if test="starts-with($artikel[1]/A1, 'c 1 ')=false()">
          <Artikel>
            <xsl:apply-templates select="$artikel" mode="call"/>
          </Artikel>
        </xsl:if>
      </xsl:for-each>
      <xsl:value-of select="system-property('xsl:vendor')"/>
    </AmsStammdaten>
  </xsl:template>
  <xsl:template match="Csv" mode="call">
    <xsl:choose>
      <xsl:when test="starts-with(A1, 'c')">
        <xsl:element name="DistributorProductId">
          <xsl:value-of select="substring-before(substring-after(A1, ' '), ' ')"/>
        </xsl:element>
        <xsl:element name="action">
          <xsl:value-of select="substring(substring-after(substring-after(A1, ' '), ' '), 1, 6)"/>
        </xsl:element>
      </xsl:when>
      <xsl:when test="A1='f 42'">
        <xsl:element name="EAN">
          <xsl:value-of select="A2"/>
        </xsl:element>
      </xsl:when>
      <xsl:when test="A1='f 46'">
        <xsl:element name="Titel">
          <xsl:value-of select="A2"/>
        </xsl:element>
      </xsl:when>
      <xsl:when test="A1='f 48'">
        <xsl:element name="VerkaufsPreis">
          <xsl:value-of select="A2"/>
        </xsl:element>
      </xsl:when>
    </xsl:choose>
  </xsl:template>
</xsl:stylesheet>

--- source ---

<?xml version="1.0" encoding="ISO-8859-1"?>

<CsvRootTag>
  <Csv>
    <A1>{</A1>
  </Csv>
  <Csv>
    <A1>c 206558 FTCNDX;</A1>
  </Csv>
  <Csv>
    <A1>f 41</A1>
    <A2>4015222553940</A2>
    <A3>;</A3>
  </Csv>
  <Csv>
    <A1>f 89</A1>
    <A2>BURELL,KENNY*MIDNIGHT BLUE</A2>
    <A3>;</A3>
  </Csv>
  <Csv>
    <A1>f 44</A1>
    <A2>Burrell,Kenny</A2>
    <A3>;</A3>
  </Csv>
  <Csv>
    <A1>f 46</A1>
    <A2>Midnight Blue Crudy van Gelder</A2>
    <A3>;</A3>
  </Csv>
  <Csv>
    <A1>f 45</A1>
    <A2/>
    <A3>;</A3>
  </Csv>
  <Csv>
    <A1>f 53</A1>
    <A2>Burrell,Kenny</A2>
    <A3>;</A3>
  </Csv>
</CsvRootTag>

-- 
Viele Grüße / best regards

Marc Pellmann
_______________________________
inubit - the integration experts
inubit AG
Lützowstraße 105-106
D-10785 Berlin
Fon: +49.30. 72 61 12-132
Fax: +49.30. 72 61 12-100
Freecall: 0800-go inubit
Web: www.inubit.com