RE: [xsl] Problem with XPath in my XSL

["Michael Kay" <mike@xxxxxxxxxxxx>]

When a variable is declared like this:

<xsl:variable name="raum" select="raum"></xsl:variable>

and there is no child::raum element, the value of $raum is an empty
node-set.

$raum != ""

tests whether any of the nodes in $raum is not equal to "". There aren't any
such nodes, so the result is false.

You want

not($raum = "")

Alternatively, make your variable a string by writing it as

<xsl:variable name="raum" select="string(raum)"/>

An empty node-set will then be converted to an empty string.

Michael Kay



> -----Original Message-----
> From: Christian Barth [mailto:christian@xxxxxxxxxxxxx]
> Sent: 23 January 2006 14:49
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: [xsl] Problem with XPath in my XSL
>
> 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