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RE: Muenchian method, and keys 'n stuff
- From: DPawson at rnib dot org dot uk
- To: xsl-list at lists dot mulberrytech dot com
- Date: Wed, 23 Jan 2002 13:19:15 -0000
- Subject: RE: [xsl] Muenchian method, and keys 'n stuff
- Reply-to: xsl-list at lists dot mulberrytech dot com
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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