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.
--
Andrew Welch
http://andrewjwelch.com
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