[4suite] error with position() in arithmetic expressions

[Sam Brauer]

I am trying to use an <xsl:if> to set the background color of every other
row in an html table that my stylesheet produces.

Something like this simple example:

<xsl:template match="person">
  <tr>
    <xsl:if test="position() mod 2 = 1">
      <xsl:attribute name="bgcolor">#dddddd</xsl:attribute>
    </xsl:if>
    <td>
      <xsl:value-of select="firstname"/>
      <xsl:value-of select="lastname"/>
    </td>
    <td>
      <xsl:value-of select="email"/>
    </td>
  </tr>
</xsl:template>


I get the following error:
    processor.appendStylesheetNode(sheet)
  File
"/usr/local/lib/python2.0/site-packages/_xmlplus/xslt/Processor.py", line
 94, in appendStylesheetNode
    sty = StylesheetReader.FromDocument(styleSheetNode, baseUri)
  File
"/usr/local/lib/python2.0/site-packages/_xmlplus/xslt/StylesheetReader.py
", line 197, in FromDocument
    sheet.setup()
  File
"/usr/local/lib/python2.0/site-packages/_xmlplus/xslt/Stylesheet.py", lin
e 144, in setup
    curr_node.setup()
  File
"/usr/local/lib/python2.0/site-packages/_xmlplus/xslt/IfElement.py", line
 33, in setup
    self.__dict__['_expr'] = parser.parseExpression(self._test)
  File
"/usr/local/lib/python2.0/site-packages/_xmlplus/xpath/XPathParser.py", l
ine 36, in parseExpression
    XPathParserBase.XPathParserBase.parse(self, st)
  File
"/usr/local/lib/python2.0/site-packages/_xmlplus/xpath/XPathParserBase.py
", line 60, in parse
    XPath.cvar.g_prodNum)
SyntaxException:
********** Syntax Exception **********
Exception at or near "mod"
  Line: 0, Production Number: 0



I did some experimentation and found that the following expressions work
correctly:
"position()"
"position() + 2"
"position() - 2"

But these do not:
"position() * 2"
"position() div 2"
"position() mod 2"


I'm using the latest 4Suite (0.10.1) with Python2.0 on Linux.

Is this a bug?  I'm pretty sure my XSL is legal.  I've done similar stuff
in the past with Xalan (Java XSLT processor).

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Sam Brauer : Systems Programmer : sam at webslingerZ.com