Re: [xsl] Create a list of values from multiple elements

On 7/4/07, Michael Eberhard <michael_eberhard(_at_)gmx(_dot_)at> wrote:
> Hi,
>
> I want to create a list of IDs while transforming one part of the XML document, 
> as the transformation of the second part is based on the IDs chosen before.
>
> The input XML document looks like this:
>
> <MainElement id="0" val="10"/>
> <MainElement id="1" val="20"/>
> <MainElement id="2" val="30"/>
> <ExtElement mid="0" ... />
> <ExtElement mid="0" ... />
> <ExtElement mid="1" ... />
> <ExtElement mid="2" ... />
>
> The style sheet has a parameter, which allows to specify the desired maximum 
> value. If the input parameter is a value of 20, the output should look like 
> this:
>
> <MainElement id="0" val="10"/>
> <MainElement id="1" val="20"/>
> <ExtElement mid="0" ... />
> <ExtElement mid="0" ... />
> <ExtElement mid="1" ... />
>
> My question is now, how can I store the IDs of the MainElements while 
> processing them in order to have the IDs available when processing the 
> ExtElements (using XSLT 1.0).

Use the identity transform with a no-op template for each of
conditions where you don't want to copy the input to the result.  The
tricky part of looking up the <MainElement> from the <ExtElement> can
be done using a key:

<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>

<xsl:param name="max" select="'20'"/>

<xsl:key name="mainElem-by-id" match="MainElement" use="@id"/>

<xsl:template match="@*|node()">
        <xsl:copy>
                <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
</xsl:template>

<xsl:template match="MainElement[(_at_)val > $max]"/>

<xsl:template match="ExtElement[key('mainElem-by-id', @mid)/@val > $max]"/>

</xsl:stylesheet>

generates:

<MainElement id="0" val="10"/>
<MainElement id="1" val="20"/>

<ExtElement mid="0"/>
<ExtElement mid="0"/>
<ExtElement mid="1"/>

cheers
andrew
--
http://andrewjwelch.com

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