Hi,
Furthermore store the results of calculations in variables if you need
them more often.
Is this advice true? If I need the same 'select' ten (or ten thousand)
times in a program,
isn't it just simpler to write that select and let the implementation
memoize it?
Yes it would be simpler, but what if the application isn't.
Its value will not change since the data is the same. Why should I
manually
'cache' values if the data model allows to do it consistently and
automatically?
I agree if applications would cache it automatically. I wouldn't have to do
it by hand, but I'm don't write parser code and I have no idea how easy or
difficult such a thing would be. However I do know, from other threads
started by you actually, that many possible performance optimizations are
not implemented by all parsers. Such is true, if I understand it correctly
for tail recursion which is optimized by Saxon and jd.xslt but not by other
parsers.
Cheers,
Agnes
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