RE: [xsl] Conditional Assigining

["Michael Kay" <mhkay@xxxxxxxxxxxx>]

>
> <xsl:variable name="ID">-1</xsl:variable>
> <xsl:for-each select="Section[parentID='0']">
> 	<xsl:if test="$ID=-1">
> 		<xsl:variable name="ID" select="sectionID" />
> 	</xsl:if>
> id <xsl:value-of select="$ID"/>
>
XSLT isn't a sequential programming language, you are trying to use it as if
it were. You can't do things in one iteration of xsl:for-each that affect
subsequent iterations, because there is no such thing as "subsequent" in a
non-sequential language. (See my XSLT Programmer's Reference for an essay on
the subject...)

Instead you want something like

<xsl:for-each select="Section[parentID='0']">
  <xsl:choose>
  <xsl:when test="preceding-sibling::Section[parentID='0']">
     <xsl:value-of select="preceding-sibling::Section[parentID='0'][1]"/>
  </xsl:when>
  <xsl:otherwise>-1</xsl:otherwise>
  </xsl:choose>
</xsl:for-each>

That works because it expresses the output as a function of the input.

Mike Kay


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