xsl:if

David Carlisle

How to test if there is only one child element and it's name is bva.

<xsl:if test="*[last() = 1 and self::bva]">

Jeni expands:

Or you could translate what you said in English into XSLT almost word for word:

 test="count(child::*) = 1 and bva"

Garry Paskin elaborates

> Pardon me, but I understand last() returns the order number of the last node
> of -any- node under the context node.

Yes, but don't forget XPath section 2.4: "A predicate filters a node-set with respect to an axis to produce a new node-set. For each node in the node-set to be filtered, the PredicateExpr is evaluated >> with that node as the context node << with the number of of nodes in the node-set as the context size and with the proximity position of the node in the node-set with respect to the axis as the context position ..."(emphasis added).

 <xsl:if test="bva[last() = 1]">

In the example above, the node-set to be filtered is the set of all bva nodes since that is to the left of the predicate. The predicate 'last() = 1' is evaluated with respect to _that_ node-set. So the first test above does indeed test to see if there is only one node in that node-set, in other words, if there is only one bva node.

Dan Machak

Q expansion:

 I have a XML file like this:

 <SECTION>
 <DATA>...</DATA>
 <DATA>...</DATA>
 <SUMMARY>..<SUMMARY>
 </SECTION>
 <SECTION>
 <DATA>...</DATA>
 <DATA>...</DATA>
 </SECTION>

 If there's no summary I want to output all <DATA> elements of a
 <SECTIONS> but if the summary is present I only want to output the
 <SUMMARY>:

 <SECTION>
 <SUMMARY>..<SUMMARY>
 </SECTION>
 <SECTION>
 <DATA>...</DATA>
 <DATA>...</DATA>
 </SECTION>





<xsl:stylesheet 
 xmlns:xsl="http://www.w3.org/1999/XSL/Tranform"     
version="1.0">

<xsl:template match="doc">
  <xsl:apply-templates/>
</xsl:template>

<xsl:template match="SECTION">
<SECTION>
<xsl:if test="count(SUMMARY)=0">
<xsl:apply-templates select="DATA"/>
</xsl:if>
<xsl:apply-templates select="SUMMARY"/>
</SECTION>
</xsl:template>

<!-- copy elements straight through -->
<xsl:template match="*|@*" priority="-1">
   <xsl:copy>
     <xsl:apply-templates select="@*|*|text()"/>
   </xsl:copy>
</xsl:template>

</xsl:stylesheet>
            

David Carlisle

	<xsl:when test="./sprogit">
	

You never need to start such a test with ./ that is equivalent to

		<xsl:when test="sprogit">

which is short for

		<xsl:when test="child::sprogit">

which tests if the current node has a spogit child. You want to test if the current node is a sprogit, which would be self::sprogit however doing such an xsl:choose is rather a strange way to code things, why not just apply-templates and then have separate templates matching each of the possible children?

Don Bruey offers

  <xsl:when test="name()='sprogit'">