[xml] bug with variables and predicates

[Vojtech Fried]

Hi,

In our app, we use libxml2 and we connect XPath variables to our proprietary 
script language and its variables. I have recently noticed a possible bug with 
it. To replicate the issue, I have created an xslt. Handling of variables is a 
bit grey zone for me, but I think there has to be a bug somewhere in libxml2.

First the xslt (note the different bracketing around $array):
<?xml version="1.0"?>

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:exsl="http://exslt.org/common";>

<xsl:variable name="array_orig">
              <item>1234</item>
              <item>12</item>
              <item>123</item>
              <item>1</item>
</xsl:variable>

<xsl:variable name="array" select="exsl:node-set($array_orig)/item"/>

<xsl:template match="/">
              <data>
                             <cnt><xsl:value-of select="count($array)"/></cnt>
                             <l1><xsl:value-of 
select="string-length($array[1])"/></l1>
                             <l2><xsl:value-of 
select="string-length(($array)[1])"/></l2>
                             <l3><xsl:value-of 
select="string-length($array[2])"/></l3>
                             <l4><xsl:value-of 
select="string-length(($array)[2])"/></l4>
                             <test1>
                                           <xsl:for-each 
select="$array[string-length($array[1])]">
                                                         <xsl:element 
name="{name()}">
                                                                       
<xsl:value-of select="."/>
                                                         </xsl:element>
                                           </xsl:for-each>
                             </test1>
                             <test2>
                                           <xsl:for-each 
select="$array[string-length(($array)[1])]">
                                                         <xsl:element 
name="{name()}">
                                                                       
<xsl:value-of select="."/>
                                                         </xsl:element>
                                           </xsl:for-each>
                             </test2>
                             <test3>
                                           <xsl:for-each 
select="$array[string-length($array[2])]">
                                                         <xsl:element 
name="{name()}">
                                                                       
<xsl:value-of select="."/>
                                                         </xsl:element>
                                           </xsl:for-each>
                             </test3>
                             <test4>
                                           <xsl:for-each 
select="$array[string-length(($array)[2])]">
                                                         <xsl:element 
name="{name()}">
                                                                       
<xsl:value-of select="."/>
                                                         </xsl:element>
                                           </xsl:for-each>
                             </test4>
              </data>
</xsl:template>

</xsl:stylesheet>

Xslproc produces (xml file is not important, you can use any, I have added 
whitespace):
<?xml version="1.0"?>
<data xmlns:exsl="http://exslt.org/common";>
<cnt>4</cnt>
<l1>4</l1>
<l2>4</l2>
<l3>2</l3>
<l4>2</l4>
<test1/>
<test2>
<item>1</item>
</test2>
<test3/>
<test4/>
</data>

I would expect to have "item" element also in test1, test3 and test4. The 
string lengths are 4 or 2 (see l1, l2, l3, l4). There are four elements in 
$array, see "cnt" element. I have tried it with ms xslt and the "item" elements 
are there as I would expect.

Vojtech

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