side effects when debugging

Hi everybody,

I hope I don't mention a known problem though I checked the xsl faq and the 
list archives.

I experienced strange behaviour depending on the debug settings of the 
processor (see processor version below).

Vendor: Apache Software Foundation
Vendor URL: http://xml.apache.org/xalan-j

I am using the following stylesheet:

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";> 
  

  <xsl:output method="xml" version="1.0" indent="yes"/>

  <xsl:template match="D">
      <xsl:for-each select="A">
              <xsl:sort select="POSITION" data-type="number" 
order="ascending"/>
              <xsl:element name="PositionNr">
                     <xsl:value-of select="POSITION"/>
              </xsl:element>  
      </xsl:for-each>
  </xsl:template>    
</xsl:stylesheet>



The input file looks like this:

<?xml version = "1.0" encoding = "ISO-8859-1"?>
<D>
      <A>
         <POSITION>5</POSITION>
         <ACTION>1</ACTION>
      </A>    
      <A>
         <POSITION>1</POSITION>
         <ACTION>1</ACTION>
      </A>    
      <A>
         <POSITION>3</POSITION>
         <ACTION>1</ACTION>
      </A>    
</D>


Without debugging options (command line inline), the result looks like this 
(obviously correct):

t:/Programme/JRE/1.4.1/bin/java.exe -cp 
d:/cvsworking/nl/dev/classes/xalan.jar 
    org.apache.xalan.xslt.Process -in 
d:/cvsworking/nl/dev/java/newtron/system/impl/a2a/std/ressources/mapping/test/xml/test_sort.xml
 
    -xsl 
d:/cvsworking/nl/dev/java/newtron/system/impl/a2a/std/ressources/mapping/test/xslt/test_sort.xslt
<?xml version="1.0" encoding="UTF-8"?>
<PositionNr>1</PositionNr>
<PositionNr>3</PositionNr>
<PositionNr>5</PositionNr>


But enabling debugging (for instance trace selection events = -TS), the 
result is different (though using the same input):

t:/Programme/JRE/1.4.1/bin/java.exe -cp 
d:/cvsworking/nl/dev/classes/xalan.jar 
    org.apache.xalan.xslt.Process -TS -in 
d:/cvsworking/nl/dev/java/newtron/system/impl/a2a/std/ressources/mapping/test/xml/test_sort.xml
     -xsl 
d:/cvsworking/nl/dev/java/newtron/system/impl/a2a/std/ressources/mapping/test/xslt/test_sort.xslt
<?xml version="1.0" encoding="UTF-8"?>
<PositionNr>1</PositionNr>
<PositionNr>3</PositionNr>
<PositionNr>5</PositionNr>
<PositionNr>5</PositionNr>
<PositionNr>1</PositionNr>
<PositionNr>3</PositionNr>


As you can see, in the second case, firstly all nodes are sorted correctly, 
but additional the same nodes are added in document order.

Is this a "design mistake" by me or a bug/something specific to xalan ? In 
this case, I might post it to some xalan list.


Thx a lot in advance

Cheers Nick


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