Xalan bug?

Hello,
I was solving a problem posted by a user at
microsoft.public.xsl newsgroup. I seem to have been
hit by a Xalan bug(Xalan-J 2.6.0), which I wish to
confirm with members here.. 

The problem posted was -
Subject: Grouping by two or any number
--------------------------------------
i have the following xml

<Parent>
  <node>a</node>
  <node>s</node>
  <node>d</node>
  <node>f</node>
  <node>g</node>
  <node>h</node>
  <node>j</node>
  <node>k</node>
  <node>l</node>
</Parent>


Need to print in following format (into groups of two)

group 1 - a,s
group 2 - d,f
group 3 - g,h
group 4 - j,k
group 5 - l

I wrote the following stylesheet -

<?xml version="1.0"?> 
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
 
<xsl:output method="text" /> 

<xsl:param name="group-size" select="3" />
 
<xsl:template match="/Parent">
   <xsl:variable name="n" select="count(node) -
(floor((count(node) div $group-size)) * $group-size)"
/>
   
   <xsl:for-each select="node">
     <xsl:if test="(position() mod $group-size) = 0">
       group <xsl:value-of select="floor(position()
div $group-size)" /><xsl:text> - </xsl:text>
       <xsl:for-each select=". |
preceding-sibling::node[position() &lt;= ($group-size
- 1)]">         
         <xsl:value-of select="." /><xsl:if
test="(position() mod $group-size) !=
0"><xsl:text>,</xsl:text></xsl:if>       
       </xsl:for-each>
       <xsl:text>&#xa;</xsl:text>
     </xsl:if> 
     <xsl:if test="((position() = last()) and
((position() mod $group-size) != 0))">
       group <xsl:value-of select="floor(position()
div $group-size) + 1" /><xsl:text> - </xsl:text>
       <xsl:for-each select=". |
preceding-sibling::node[position() &lt; $n]">
         <xsl:value-of select="." /><xsl:if
test="position() !=
last()"><xsl:text>,</xsl:text></xsl:if> 
       </xsl:for-each>
       <xsl:text>&#xa;</xsl:text>
     </xsl:if>
   </xsl:for-each>
</xsl:template>
   
</xsl:stylesheet>

I invoke Xalan like this:
java org.apache.xalan.xslt.Process -in file.xml -xsl
file.xsl -PARAM group-size 2

The output is fine for -PARAM group-size values of
1,2,3 & 4. But for -PARAM group-size values of 5 and
above, the ouput is not coming as expected. For e.g.,
for -PARAM group-size 5, the output received is -

group 1 - a,s,d,f,g
group 2 - h,

I tested the same XSL with Saxon-SA 8.1.1 and MSXSL 4,
and both produce correct result for all the cases.
Both Saxon and MSXSL produce the following output for
group-size=5 -

group 1 - a,s,d,f,g
group 2 - h,j,k,l

Does this look like a Xalan bug?

Regards,
Mukul


		
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