[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: things about grouping
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.
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