Number formatting: <xsl:number> vs. format-number()

Hi All!
I have a question for the specification specialists among us:

Shouldn't these two lines produce the same output ?

     Combination <xsl:value-of select="format-number
($combinationIndex,'I')"/>:

     Combination <xsl:number value="$combinationIndex" format="I"/>:

Using Xalan I get these outputs:

     Combination I1:

     Combination I:

For some reason I get both the newly formatted and the original number when
I use the "format-number" function but only the newly formatted number when
I use <xsl:number>. Is this behaviour correct? I don't think it is, but
maybe I missed part of the specification...

So long,
     Ragnar


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