RE: [xsl] Muenchian method, and keys 'n stuff

[DPawson@xxxxxxxxxxx]

Jeni wrote:

> First, an iteration over the alphabet, which I'll do using the method
> Dimitre suggested (since this is the only one that's actually
> supported in the current WDs).

Is the context not 'wrong' since it becomes the string in the variable?



> A key might be more efficient, but to make it simple, I'll just
> collect the r elements by their Ra/lett equalling the $letter:
> 
>   <xsl:for-each select="1 to string-length($l)">
>     <xsl:variable name="letter" select="substring($l, ., 1)" />
>     <xsl:variable name="books" select="r[Ra/lett = $letter]" />

I.e. books won't be selected, because the context will be
  the variable?
Or is the context not changed when used like this?
  (at variance with 1.0)



> Within the xsl:when, we want to group the books by their Ra/auth. This
> is very easy in XSLT 2.0 with the xsl:for-each-group instruction,
> using the group-by attribute:
> 
>   <xsl:for-each select="1 to string-length($l)">
>     <xsl:variable name="letter" select="substring($l, ., 1)" />
>     <xsl:variable name="books" select="r[Ra/lett = $letter]" />
>     <xsl:choose>
>       <xsl:when test="$books">
>         <xsl:for-each-group select="$books"
>                             group-by="Ra/auth">
>           <h2><xsl:value-of select="Ra/auth" /></h2>
>           ...
>         </xsl:for-each-group>

Now that is neat!

> And finally to apply templates to each of the r elements to get their
> details, we retrieve the r elements in the particular author group
> using the current-group() function:
> 
>   <xsl:for-each select="1 to string-length($l)">
>     <xsl:variable name="letter" select="substring($l, ., 1)" />
>     <xsl:variable name="books" select="r[Ra/lett = $letter]" />
>     <xsl:choose>
>       <xsl:when test="$books">
>         <xsl:for-each-group select="$books"
>                             group-by="Ra/auth">
>           <h2><xsl:value-of select="Ra/auth" /></h2>
>           <xsl:apply-templates select="current-group()" />

I see what Steve meant, when he said his namesake method is
now redundant! And him only 21!


Regards DaveP. Again, thanks Jeni.


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