Re: [xsl] Sorting Problem

[Jörg Heinicke <joerg.heinicke@xxxxxx>]

Hi Dev,

I think I understood: You want to know the "highest" school, which a pupil
with this or that name attends.

I build a dynamical version, I hope it was not to much "fun-work". I added
the ranking-information to the XML like the following:

<records>
    <pupil/>
    ...
    <schools>
        <school valuation="1">Cambridge</school>
        <school valuation="2">Oxford</school>
        <school valuation="3">Eton</school>
    </schools>
</records>

You can put this information to an extra-file or anywhere you want, you only
must adapt the stylesheet then.

Furthermore I don't know if it's a very nice solution, maybe somebody has a
better one.

<?xml version="1.0"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0">
    <xsl:output indent="yes"/>
    <xsl:key name="pupils" match="pupil" use="name"/>

    <xsl:template match="records">
        <xsl:copy>
            <xsl:apply-templates
select="pupil[count(.|key('pupils',name)[1])=1]">
                <xsl:sort select="count(key('pupils',name))"
order="descending"/>
            </xsl:apply-templates>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="pupil">
        <xsl:copy>
            <xsl:apply-templates select="name"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="name">
        <xsl:copy>
            <xsl:value-of select="."/>
        </xsl:copy>
        <school>
            <xsl:call-template name="getSchool">
                <xsl:with-param name="schools">
                    <xsl:for-each select="key('pupils',.)/school">
                        <xsl:value-of select="text()"/>
                    </xsl:for-each>
                </xsl:with-param>
            </xsl:call-template>
        </school>
    </xsl:template>

    <xsl:template name="getSchool">
        <xsl:param name="schools"/>
        <xsl:param name="valuation" select="'1'"/>
        <xsl:choose>
            <xsl:when
test="contains($schools,/records/schools/school[@valuation=$valuation])">
                <xsl:value-of
select="/records/schools/school[@valuation=$valuation]"/>
            </xsl:when>
            <xsl:otherwise>
                <xsl:call-template name="getSchool">
                    <xsl:with-param name="schools" select="$schools"/>
                    <xsl:with-param name="valuation" select="$valuation +
1"/>
                </xsl:call-template>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>
</xsl:stylesheet>

Do you understand the stylesheet? The working with keys, especially the
'count(.|key('pupils',name)[1])=1'-construct? This is the 'grouping using
the muenchian method'. More information on this you can find here:
http://www.jenitennison.com/xslt/grouping/muenchian.html.

Hope this helps for the first.

Joerg


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