This post is full of self-help realism, and completely lacks
explanation. That's for a reason -- I'm not near a reference work to
double check on the reason. :-)
Specifically in XALAN-C processor.
I also don't have ready access to the Xalan-C processor, but using
`xsltproc`, I found it instructive to put content into the <dd>
elements and examine the output of the following two stylesheets. The
first is just like yours (except the do-nothing conditional is
removed), and the second is the same but with apply-templates instead
of value-of.
Input
-----
<?xml version="1.0" encoding="UTF-8"?>
<a>
<dd>one</dd>
<dd>two</dd>
<dd>three</dd>
</a>
Test1
-----
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="xml" encoding="UTF-8"/>
<xsl:template match="/">
<xsl:variable name="a">
<xsl:value-of select="//dd"/>
</xsl:variable>
<xsl:value-of select="count($a)"/>
<xsl:text>: "</xsl:text>
<xsl:value-of select="$a"/>
<xsl:text>"</xsl:text>
</xsl:template>
</xsl:stylesheet>
Test2
-----
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="xml" encoding="UTF-8"/>
<xsl:template match="/">
<xsl:variable name="a">
<xsl:apply-templates select="//dd"/>
</xsl:variable>
<xsl:value-of select="count($a)"/>
<xsl:text>: "</xsl:text>
<xsl:value-of select="$a"/>
<xsl:text>"</xsl:text>
</xsl:template>
</xsl:stylesheet>
Output1
-------
<?xml version="1.0" encoding="UTF-8"?>
1: "one"
Output2
-------
<?xml version="1.0" encoding="UTF-8"?>
1: "onetwothree"
In both cases it seems as though $a contains only 1 thing, a string.
(You can test that it is not a node set by using $a in the select= of
a for-each -- you should get a runtime error, since it is a string.)
So, my objective is to get the count() function to count the number of
'dd' elements.
test.xsl
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="xml" encoding="UTF-8"/>
<xsl:template match="/">
<xsl:variable name="a">
<xsl:choose>
<xsl:when test="1=1">
<xsl:value-of select="//dd"/>
</xsl:when>
</xsl:choose>
</xsl:variable>
<xsl:value-of select="count($a)"/>
</xsl:template>
</xsl:stylesheet>
test.xml
<a>
<dd/>
<dd/>
<dd/>
</a>
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