Re: [xsl] XSL Grouping

Subject: Re: [xsl] XSL Grouping
From: Jeni Tennison <jeni@xxxxxxxxxxxxxxxx>
Date: Mon, 12 Nov 2001 17:56:22 +0000
Hi David,

> This is one transaction. First we group by Status, no prob. Now I
> want to group by CurrencyCode within each Status group. I'm just not
> seeming to get the right combo of xsl:key and key() XPath in the sub
> for-each. Can someone lend a hand? Tx :)

Sure. The key that you use for the second level group has to index
each Transaction by a combination of its Status and its CurrencyCode.
The easiest way to get such a combination value is using the concat()
function, so try:

<xsl:key name="TransactionsByStatusAndCurrencyCode"
         use="concat(Status, '::', CurrencyCode)" />

[Obviously you don't have to use such a long name, I'm just doing so
to make things clear.]

At the point where currently you're retrieving all the Transaction
elements with a particular status, you need to filter that set to
include only those that have that Status *and* have a unique
CurrencyCode, with something like:

  key('TransactionsByStatus', $status)
    [generate-id() =
                     concat($status, '::', CurrencyCode))[1])]

And once you're processing such a Transaction, you can get all the
other Transaction elements with the same Status and CurrencyCode with:

      concat(Status, '::', CurrencyCode))

I hope that helps,


Jeni Tennison

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