[xsl] Problem with XPath in my XSL

["Christian Barth" <christian@xxxxxxxxxxxxx>]

Hi!

I use the XPath-Operator "and" to test some variables in a xsl:choose. See
the code:

<xsl:template match="ergebnis">
  <xsl:for-each select="objekt">
    <xsl:variable name="bau" select="bauvorhaben"></xsl:variable>
    <xsl:variable name="geb" select="gebaeude"></xsl:variable>
    <xsl:variable name="stock" select="stockwerk"></xsl:variable>
    <xsl:variable name="NZ" select="nutzungszone"></xsl:variable>
    <xsl:variable name="raum" select="raum"></xsl:variable>
    <tr>
      <td align="center"><b><xsl:value-of select='@id'/></b></td>
	<xsl:choose>
	<!-- A-SUCHE -->
	<xsl:when test="$typ = 'A'">
	  <xsl:choose>
	  <!-- F|r Elemente, die auf Gebaeude-Ebene liegen -->
	    <xsl:when test="$geb != '' and $stock = '' and $NZ = '' and
$raum = ''">
  	    <td>Gebaeude "<xsl:value-of select="$geb" />" in Bauvorhaben
"<xsl:value-of select="$bau" />"<p></p>
		Elemente kvnnten f|r Sie von Interesse sein:<br></br>
		<xsl:for-each select="*">
		<xsl:choose>
		  <xsl:when test="local-name() = 'gebTrennwaende'">
		    <xsl:call-template name="Datenanzeige">
		      <xsl:with-param name="element" select="gebTrennwand"
/>
		    </xsl:call-template>
		  </xsl:when>
   		</xsl:choose>
 	    </xsl:for-each>
	  </td>
	</xsl:when>
	<!-- F|r Elemente, die auf Stockwerk-Ebene liegen -->
-------------------------------------------------------------------
<!-- THIS TEST SHOULD BE TRUE --><xsl:when test="$stock != '' and $NZ = ''
and $raum = ''">
-------------------------------------------------------------------
	  <td>Stockwerk "<xsl:value-of select="$stock" />" von Gebaeude
"<xsl:value-of select="gebaeude" />" in Bauvorhaben "<xsl:value-of
select="bauvorhaben" />"<p></p>
	    Elemente kvnnten f|r Sie von Interesse sein:<br></br>
	    <xsl:for-each select="*">
	      <xsl:choose>
		  <xsl:when test="local-name() = 'rettungswege'">
		    <xsl:call-template name="Datenanzeige">
			<xsl:with-param name="element" select="rw" />
		    </xsl:call-template>
		  </xsl:when>
		  <xsl:when test="local-name() = 'trennwaende'">
		    <xsl:call-template name="Datenanzeige">
			<xsl:with-param name="element" select="trennwand" />
		    </xsl:call-template>
		  </xsl:when>
	      </xsl:choose>
	    </xsl:for-each>
        </td>
      </xsl:when>
      <xsl:otherwise>
	  <td>Gebaeude "<xsl:value-of select="$geb" />" in Bauvorhaben
"<xsl:value-of select="$bau" />"</td>
      </xsl:otherwise>
   </xsl:choose>
   <td align="center"><b><xsl:value-of select="gesamtSim" /></b></td>
 </xsl:when>
 <!-- B-SUCHE -->
 <xsl:when test="$typ = 'B'">
   <td><xsl:value-of select="@typ" /> "<xsl:value-of select="bezeichnung"
/>" aus Bauvorhaben "<xsl:value-of select="bauvorhaben" />" in Gebaeude
"<xsl:value-of select="gebaeude" />"</td>
   <td align="center"><b><xsl:value-of select="gesamtSim" /></b></td>
 </xsl:when>
 <!-- C-SUCHE -->
 <xsl:when test="$typ = 'C'">
   noch
 </xsl:when>
 <xsl:otherwise>
   noch
 </xsl:otherwise>
</xsl:choose>
</tr>
</xsl:for-each>
</xsl:template>



In the XML-doc used for testing this stuff, there are only the Tags
<gebaeude> and <stockwerk>. So the other variables are empty. The
xsl-processor should than enter the bold "when-clause". But it always goes
to the otherwise-Tag.

I just don't see why? Can anybody help me please?

Thanks,
Barthi