Subject: Re: [xsl] Does the count() function require access to the whole subtree? From: Michael Kay <mike@xxxxxxxxxxxx> Date: Sun, 12 Jan 2014 19:27:55 +0000 |
> Michael, doesn't the count() function require access to the whole subtree? How would a count be conducted by sitting at the top of a subtree? Perhaps you meant to say that the count() function is an absorption operation? > If you are evaluating count() or exists() on a sequence of nodes S, then when you encounter a node N that is a member of this sequence you know its impact on the result as soon as you see its start tag; you do not need to look at its subtree. This makes it different from, say, sum() or "=". This means that the existence of overlapping nodes within S is no problem for count() or exists(), whereas it is a problem for sum() or "=". Michael Kay Saxonica
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