Brian Aker wrote:
Hi!
On Sep 11, 2008, at 11:38 AM, Jim Starkey wrote:
Cast is a standard and useful feature for forcing conversions. I see
no purpose for Convert with a single internal character set.
A lot of the "2" + 2 stuff we do automatically, so convert() is less
useful (though I will full acknowledge that some of the auto conversion
is too friendly).
Could somebody say something about the general philosophy for
collations? How do they interact with comparisons?
The only thing that comes to mind is "A" == "a", aka case, also umlaut
vs non-umlaut characters for other languages. So it is not only a
question of sort, but in doing comparison to names.
With a library like ICU that implements the Unicode Collation Algorithm,
you can specify the "level" you want to sort on, e.g level 1 is letters
only, level 2 is letters and accents, level 3 adds case. And this is
independent of the collation in use. It is used for comparisons and for
sorting.
Roy
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