Subject: Re: [xsl] things about grouping From: Ihe Onwuka <ihe.onwuka@xxxxxxxxx> Date: Fri, 30 Nov 2012 03:29:35 +0000 |
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. > Actually in the context of the expression (* except (heading,para)) we can substitute | for , because the except dedups anyway.
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