RE: [xsl] Re: lookup-table thoughts (was Re: matching multiple times, outputting once?

["Michael Kay" <michael dot h dot kay at ntlworld dot com>]

> I assume that "O(n^n)" above is a typo for "O(n^2)" = "O(n*n)", right?
yes.

> Quadratic. Let me just check that I understand this from
> Saxon's point of
> view...I'm trying to come up with a simple moral to the tale,
> something
> like "recursion inside constructors should not usually be
> made into tail
> recursions, but other recursions should be", to go along with
> "accumulations
> of associative functions can usually be made into divide-and-conquer
> templates" and other such rules that I often find helpful.

The difference between a tail-recursive linear recursion and a
non-tail-recursive one is that the latter uses less stack space. The moral
of the tail [?], I think, is that unless you're actually running out of
stack space, it's not worth changing an O(n) algorithm into an O(n*n) one in
order to achieve this goal.

But I must look again at whether I can make <xsl:copy-of>, when copying one
RTF to another, do a "virtual copy" that only actually creates a
reference...

Mike Kay


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