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RE: [xsl] Grouping upon various attribute values

2006-08-16 06:55:28
There's no direct support for composite grouping keys in xsl:for-each-group.
The simplest solution is to form the composite key yourself. The following
looks promising:

group-by="string-join(@*, '|')" 

but is wrong, because the result depends on attribute order. If you know
what attributes you're interested in, use

group-by="concat(@aufAttribut, '|', @typ, '|', @wertStruktur...)"

Alternatively:

group-by="f:all-attributes(.)"

<xsl:function name="f:all-attributes" as="xs:string">
  <xsl:param name="node" as="element()"/>
  <xsl:value-of>
    <xsl:for-each select="$node/@*">
      <xsl:sort select="namespace-uri()"/>
      <xsl:sort select="local-name()"/>
      <xsl:value-of select="."/>
      <xsl:text>|</xsl:text>
    </xsl:for-each>
  </xsl:value-of>
</xsl:function>

The other approach is nested groups:

<xsl:for-each-group group-by="@aufAttribute">
  <xsl:for-each-group select="current-group()" select="@typ">
    <xsl:for-each-group select="current-group()" select="@wertStruktur">
      ...

Michael Kay
http://www.saxonica.com/


-----Original Message-----
From: lawrence(_dot_)michel(_at_)post(_dot_)ch 
[mailto:lawrence(_dot_)michel(_at_)post(_dot_)ch] 
Sent: 16 August 2006 14:26
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: [xsl] Grouping upon various attribute values

Hi all,

I have a little problem, which gives me a bit headache at the moment.
Maybe you could help me solve it :

Here the given XML :

              <produktenZumAnalysieren>
                      <gesamtMenge>
                              <filter aufAttribut="Name_Stat"
typ="diskret" wertStruktur="baum" wert="BP"/>
                              <filter aufAttribut="FrankaturArt"
typ="diskret" wertStruktur="genau" wert="PP"/>
                      </gesamtMenge>
              </produktenZumAnalysieren>
              <produktenZumAnalysieren>
                      <gesamtMenge>
                              <filter aufAttribut="Name_Stat"
typ="diskret" wertStruktur="baum" wert="BP"/>
                              <filter aufAttribut="FrankaturArt"
typ="diskret" wertStruktur="genau" wert="PP"/>
                      </gesamtMenge>
              </produktenZumAnalysieren>
              <produktenZumAnalysieren>
                      <gesamtMenge>
                              <filter aufAttribut="Name_Stat"
typ="diskret" wertStruktur="baum" wert="BP"/>
                              <filter aufAttribut="Gewicht"
typ="interval" wert_Ab="1" wert_Bis="100"/>  //<- Careful 
here, there is a new set of attributes
                      </gesamtMenge>
      </produktenZumAnalysieren>

As you can see, there are three "gesamtMenge" elements, each 
in its own "ProduktZumAnalysieren" element.

Now, I would like to apply a for-each-group loop on them :

      <xsl:for-each-group select="produktenZumAnalysieren"
group-by="gesamtMenge/filter/@* (KICKME HERE)">

That is, the grouping key isn't doing what I expect: I need 
to have all attributes taken in consideration for grouping 
the required elements. In this example, I should have two 
distinctive groups

Any help would be really greatfull ;-)

Cheers

Lawrence Michel, Bern, Switzerland

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