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Re: [xsl] things about grouping

Subject: Re: [xsl] things about grouping
From: Ihe Onwuka <ihe.onwuka@xxxxxxxxx>
Date: Thu, 29 Nov 2012 08:25:44 +0000

On Thu, Nov 29, 2012 at 8:22 AM, Ihe Onwuka <ihe.onwuka@xxxxxxxxx> wrote:
> On Thu, Nov 29, 2012 at 8:18 AM, Ihe Onwuka <ihe.onwuka@xxxxxxxxx> wrote:
>> On Thu, Nov 29, 2012 at 8:15 AM, Andrew Welch <andrew.j.welch@xxxxxxxxx> wrote:
>>>> the comma operator corresponds to union written as | (by definition a
>>>> set is unordered so the additional ordering constraint imposed by the
>>>> , operator is meaningless)
>>> The comma is just a way of separating items in sequence, whereas union
>>> de-dupes and sorts into document order.
>>> select="@foo, @foo, @foo"
>>> vs
>>> select="@foo | @foo | @foo"
>>> the former selects a sequence of 3 items, the latter a sequence of 1.
>> ok but I'm translating , into a set-theoretic construct, in which
>> domain a,b is indistinct from a|b - correct me if I have got that
>> wrong.
> sorry you mean the deduping........
> well you are no longer dealing in sets ...... so if you apply a
> set-theoretic construct then all bets are off and the law of the
> jungle applies.

or to put it another way that is as much type abuse as applying a
numeric operator to a string and for that reason I would walk away
from such expressions.

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