[xsl] <xsl:number from=...> different behavior (MSXML3 vs sa

I found a problem about interpretation of <xsl:number from=...>.
See the following example.

--------------- test.xsl ------------------------
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                version="1.0">
  <xsl:template match="/">
    <html>
      <body>
        <xsl:apply-templates/>
      </body>
    </html>
  </xsl:template>
  
  <xsl:template match="part/title">
    <h1>
      <xsl:number from="book" count="part" level="any" format="I"/>
      <xsl:text> </xsl:text>
      <xsl:apply-templates/>
    </h1>
  </xsl:template>
  
  <xsl:template match="chapter/title">
    <h2>
      <xsl:number from="part" count="chapter" level="any" format="1"/>
      <xsl:text> </xsl:text>
      <xsl:apply-templates/>
    </h2>
  </xsl:template>
  
</xsl:stylesheet>
-------------------------------------------------

This test.xsl works well for documents having both <part> and <chapter>,
but if there is no <part> elements, what should be returned by
<xsl:number from="part" .../>?
(The XSLT spec seems unclear about this)

--------------- test.xml ------------------------
<book>
  <chapter><title>Uno</title>
    ...
  </chapter>
  <chapter><title>Dos</title>
    ...
  </chapter>
  <chapter><title>Tres</title>
    ...
  </chapter>
  <chapter><title>Cuatro</title>
    ...
  </chapter>
</book>
-------------------------------------------------

--------------- MSXML3 output ------------------------
<html>
  <body>
    <h2>0 Uno</h2>
    ...
    <h2>0 Dos</h2>
    ...
    <h2>0 Tres</h2>
    ...
    <h2>0 Cuatro</h2>
    ...
  </body>
</html>
------------------------------------------------------

--------------- SAXON output ------------------------
<html>
  <body>
    <h2>1 Uno</h2>
    ...
    <h2>2 Dos</h2>
    ...
    <h2>3 Tres</h2>
    ...
    <h2>4 Cuatro</h2>
    ...
  </body>
</html>
-----------------------------------------------------

Which is correct?

~~Shinyu

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list

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