In XSLT 1.0 you have 4 datatypes: number, boolean, string and nodeset.
The "most-null or nothingness" which you can have for these is
0, false, "" (empty string) or empty nodeset (such as is returned by /..)
respectively and so these values are the choices to which you are limited
to when deciding what you want to return to signify a "NULL" value aside
from returning a special sentinel value, e.g. a string such as "(NULL)".
Hope this helps.
At 02:37 PM 26/07/2007 +0000, you wrote:
HI, guru
Do you know how to assing a NULL to variable in XSL1.0? Thank you.
My problem is I want write a code as follows, but I do not know how to set
a NULL value at the following "otherwise" case:
<xsl:variable name="myvar">
<xsl:choose>
<xsl:when test="conditon a">
<xsl:value-of selcet="xxx"/>
</xsl:when>
<xsl:when test="conditon b">
<xsl:value-of selcet="xxx"/>
</xsl:when>
<xsl:otherwise>
<!-- WANT TO return a NULL value here!!!!! But It return a "" not
NULL -->
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:if test="$myvar">
.....
</xsl:if>
Justin Johansson
*** A horse with no name is called Lambda ***
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