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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: Tue, 22 Jan 2002 16:34:58 -0000
- Subject: RE: [xsl] Muenchian method, and keys 'n stuff
- Reply-to: xsl-list at lists dot mulberrytech dot com
Still having fun:
Jeni's solution [1] is the way I'm trying to go.
>From the solution below, I've refined it to:
<xsl:template match="adventure">
<h1>Adventure</h1>
<xsl:call-template name="alphabetical">
<xsl:with-param name="section" select="generate-id()"/>
</xsl:call-template>
</xsl:template>
so it passes the id val to the template. (not being used in this instance)
the problem is now that the template below never
fires the otherwise clause of the choose, and I can't see why.
I've limited the key to match on adventure/r to reduce the problem size.
<xsl:key name="auth"
match="adventure/r"
use="Ra/lett"/>
so the scope should now be restricted to those r elements
which are children of adventure.
<xsl:template name="alphabetical">
<xsl:param name="section" select="'none'"/>
<xsl:param name="alphabet" select="'abcdefghijklmnopqrstuvwxyz'" />
<xsl:if test="$alphabet != ''">
<xsl:variable name="letter"
select="substring($alphabet, 1, 1)" />
<xsl:variable name="auths"
select="key('auth', $letter )" />
<xsl:if test="$letter ='e'">
<xsl:message> Letter e:: <xsl:value-of select="$auths"/>
</xsl:message>
</xsl:if>
<xsl:choose>
<xsl:when test="$auths/node()">
<xsl:apply-templates select="r[generate-id(.)=
generate-id(key('auth',Ra/lett)[1])]"/>
</xsl:when>
<xsl:otherwise>
<p>
There are no authors beginning with
<xsl:value-of select="$letter" />
</p>
</xsl:otherwise>
</xsl:choose>
<xsl:call-template name="alphabetical">
<xsl:with-param name="alphabet"
select="substring($alphabet, 2)" />
<xsl:with-param name="section" select="$section"/>
</xsl:call-template>
</xsl:if>
</xsl:template>
Regards DaveP
> I'd just iterate over the alphabet held in a string, with a recursive
> template. It starts off with the whole alphabet and gradually whittles
> it down letter by letter until there's no alphabet left:
>
> <xsl:template name="alphabetical">
> <xsl:param name="alphabet" select="'abcdefghijklmnopqrstuvwxyz'" />
> <xsl:if test="$alphabet != ''">
> <xsl:variable name="letter"
> select="substring($alphabet, 1, 1)" />
>
> ... do things with the letter ...
>
> <xsl:call-template name="alphabetical">
> <xsl:with-param name="alphabet"
> select="substring($alphabet, 2)" />
> </xsl:call-template>
> </xsl:if>
> </xsl:template>
>
> In your case, the thing you want to do with the letter is identify
> those r elements whose Ra/lett is that letter. You can do this with
> the key that you've made, as follows:
>
> <xsl:template name="alphabetical">
> <xsl:param name="alphabet" select="'abcdefghijklmnopqrstuvwxyz'" />
> <xsl:if test="$alphabet != ''">
> <xsl:variable name="letter"
> select="substring($alphabet, 1, 1)" />
>
> <xsl:variable name="auths"
> select="key('auth', $letter)" />
> <xsl:choose>
> <xsl:when test="$auths">
> <h2>
> The letter
> <xsl:value-of select="translate($letter, $l, $u)" />
> </h2>
> <xsl:for-each select="$auths">
> <h3><xsl:value-of select="Ra/au" /></h3>
> </xsl:for-each>
> </xsl:when>
> <xsl:otherwise>
> <p>
> There are no authors beginning with
> <xsl:value-of select="$letter" />
> </p>
> </xsl:otherwise>
> </xsl:choose>
>
> <xsl:call-template name="alphabetical">
> <xsl:with-param name="alphabet"
> select="substring($alphabet, 2)" />
> </xsl:call-template>
> </xsl:if>
> </xsl:template>
>
> To call the template, all you need is:
>
> <xsl:call-template name="alphabetical" />
>
> Note that the key will give you all r elements with the same Ra/lett,
> and as such it won't be scoped within the 'adventure'. To get the
> scoping, you need to do one of the following:
>
[1]
> - include the adventure's (generated) ID within the key, and pass
> that ID to the alphabetical template
> - don't use the key to retrieve the rs with a particular Ra/lett,
> just use r[Ra/lett = $letter] instead (less efficient than a key,
> probably)
>
> Cheers,
>
> Jeni
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