RE: Positional predicates in pattern matching

Sorry, but I don't understand why you would expect anything different.
b[true()] selects the same nodes as b, so you would surely expect
b[true()][1] to match the same nodes as b[1]?

Remember that the position in the match pattern predicate relates to the
position of the node relative to its siblings; it has nothing to do with the
position of the node in the node-list selected by apply-templates.

Michael Kay 

> -----Original Message-----
> From: Kevin Jones [mailto:kjones@xxxxxxxxxxx] 
> Sent: 02 July 2004 16:35
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Positional predicates in pattern matching
> 
> 
> I have seen some behaviour in Saxon 6.5.2 and Xalan that I 
> can't really 
> explain by reading the standard. I have probably just missed 
> something but 
> would appreciate some second opinions.
> 
> If you execute,
> 
>    <xsl:template match="/">
>         <xsl:variable name="foo" select="a/b[position()>1]"/>
>         <top>
>             <xsl:apply-templates select="$foo" mode="one"/>
>             <xsl:apply-templates select="$foo" mode="two"/>
>         </top>
>     </xsl:template>
> 
>     <xsl:template match="b[1]" mode="one">P1</xsl:template>
>     <xsl:template match="b[2]" mode="one">P2</xsl:template>
>     <xsl:template match="b[3]" mode="one">P3</xsl:template>
> 
>     <xsl:template match="b[true()][1]" mode="two">R1</xsl:template>
>     <xsl:template match="b[true()][2]" mode="two">R2</xsl:template>
>     <xsl:template match="b[true()][3]" mode="two">R3</xsl:template>
> 
> Against,
> 
> <a>
>   <b/>
>   <b/>
>   <b/>
> </a>
> 
> The result is P2P3R2R3. I was expecting either P2P3R1R2 or 
> perhaps even 
> P2P3R1R1. It is obvious why you get P2P3 but that is only 
> true for the first 
> predicate of a StepPattern. In the second set of templates I 
> would expect the 
> positions should be 1 & 2 or perhaps even just 1 twice since 
> pattern matching 
> is defined as being a processes applied to individual nodes.
> 
> Thanks,
> Kev.
> 
> 
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