Re: [xsl] Keys and select distinct - is that the solution ?

["Christian Rasmussen" <christiankrasmussen@xxxxxxxxx>]

I have now tried the solutions, but none of them works.

Actually I dont think I need to use the generic_id, do I?
Because I don't need to make all the elements unique!!? As far as I
can see, I only have to pick out all the distinct codes.

By doing that I do have to match on the content of the node, and not
the element name, right!? If I match on the content/text of the node
couldn't I say something like take all the elements whose content is
not in any preeceding sibling content ???

that would give me a uniqe list of codes which I can through into a
key, that gives me the manure names

This template works, but it just writes out the manure names twice for
the code 4 and 5.

   <xsl:template name="ManureTypeNames">
       <xsl:for-each
select="eih:ManureTypeCollection/eih:ManureTypeStructure/gr:ManureTypeCode">
           <fo:block><xsl:value-of
select="key('ManureType',node())"/></fo:block>
       </xsl:for-each>
   </xsl:template>

Could someone please help me with the expath that select that matches
on the content/text and checks if there is no preeceding siblings?

please help

thanks,
- Christian












On 6/3/06, Wendell Piez <wapiez@xxxxxxxxxxxxxxxx> wrote:
> Dear Christian,
>
> XSLT 2.0 has a distinct-values() function, which
> is useful for this kind of thing, along with its native grouping
constructs.
> In XSLT 1.0, it's a fairly standard grouping
> problem. Usually we de-duplicate a set of nodes
> by determining which members of the set are the
> first (in document order) with a given value. In
> your case, you have to decide whether the value
> you want to check is the code value, or the name
> (if they're in a strict one-to-one relation it
> doesn't matter, and the value is more convenient).
>
> Keys are a very convenient way to de-duplicate
> when your data set is large. You can use brute XPath if not.
>
> So:
>
> <xsl:key name="manure-type-codes" match="gr:ManureTypeCode"
>    use="."/>
>
> <xsl:key name="manure-type-names" match="gr:ManureTypeName"
>    use="../gr:ManureTypeCode"/>
>
> <xsl:template match="gr:ManureTypeCode">
>    <xsl:if test="generate-id() =
generate-id(key('manure-type-codes',.)[1])">
>      <!-- tests true only if the ManureTypeCode is the first with this
value,
>           more or less the equivalent of 'select distinct' -->
>      <xsl:copy-of select="key('manure-type-names',.)"/>
>    </xsl:if>
> </xsl:template>
>
> If the codes and names are in a one-to-many or
> many-to-many relation, we have to think harder.
>
> I hope this helps!
> Wendell
>
> At 05:55 PM 6/2/2006, you wrote:
> >Hi experts,
> >
> >I've been struggling with a problem for several hours now, and I
> >cannot find the solution:
> >I have an XML document with a elements grouped in elements and
> >ManureTypeCodes and datavalues as siblings.
> >Then I have - somewhere else - in the document lookup information
> >(labels) for the codes.
> >These are grouped in elements of ManureTypeCodes and ManureTypeNames
> >
> >I want to create a template rule which matches the codes and looks up
> >the corresponding name and ONLY writes the
> >ManureTypeName out once! In RDBMS I would use something like select
> >distinct when selecting the codes, but I dont know what the right
> >approach is in XSLT.
> >
> >can someone please help.... on before hand thank you!
> >
> >my XML:
> ><eih>
> >    <!-- Codes and data  -->
> >    <eih:ManureTypeCollection>
> >        <eih:ManureTypeStructure>
> >            <gr:ManureTypeCode>5</gr:ManureTypeCode>
> >            <gr:ElementIdentifier>N</gr:ElementIdentifier>
> >            <gr:ElementQuantity>17.0</gr:ElementQuantity>
> >        </eih:ManureTypeStructure>
> >        <eih:ManureTypeStructure>
> >            <gr:ManureTypeCode>5</gr:ManureTypeCode>
> >            <gr:ElementIdentifier>P</gr:ElementIdentifier>
> >            <gr:ElementQuantity>0.6</gr:ElementQuantity>
> >        </eih:ManureTypeStructure>
> >        <eih:ManureTypeStructure>
> >            <gr:ManureTypeCode>4</gr:ManureTypeCode>
> >            <gr:ElementIdentifier>N</gr:ElementIdentifier>
> >            <gr:ElementQuantity>17.5</gr:ElementQuantity>
> >        </eih:ManureTypeStructure>
> >        <eih:ManureTypeStructure>
> >            <gr:ManureTypeCode>4</gr:ManureTypeCode>
> >            <gr:ElementIdentifier>P</gr:ElementIdentifier>
> >            <gr:ElementQuantity> 6.3</gr:ElementQuantity>
> >        </eih:ManureTypeStructure>
> >    </eih:ManureTypeCollection>
> >
> >    <!-- look up information for the codes -->
> >    <eih:XImanureTypeCollection>
> >        <eih:XImanureTypeStructure>
> >            <gr:ManureTypeCode>4</gr:ManureTypeCode>
> >            <gr:ManureTypeName>Fast gxdning</gr:ManureTypeName>
> >        </eih:XImanureTypeStructure>
> >        <eih:XImanureTypeStructure>
> >            <gr:ManureTypeCode>5</gr:ManureTypeCode>
> >            <gr:ManureTypeName>Ajle</gr:ManureTypeName>
> >        </eih:XImanureTypeStructure>
> >        <eih:XImanureTypeStructure>
> >    </eih:XImanureTypeCollection>
> ></eih>
> >
> >
> >best regards,
> >
> >Christian Rasmussen
> >Denmark