Peter Eisentraut wrote:
> The problem is not the syntax but that the older ICU versions don't
> support the *functionality* of ks-level2 or colStrength=secondary. If
> you try it, you will simply get a normal case-sensitive behavior.
My bad, I see now that the "old locale extension syntax" was actually
introduced at the same time than the "language tag syntax" in ICU 54:
http://bugs.icu-project.org/trac/ticket/8260
With previous versions, we'd need to call ucol_setAttribute(),
with the attributes and values defined here:
http://icu-project.org/apiref/icu4c/ucol_8h.html
for instance to get colStrength=secondary:
ucol_setAttribute(coll, UCOL_STRENGTH , UCOL_SECONDARY, &status);
which I've just checked gives the expected result with ICU-4.2.
These attributes are flagged as "Stable: ICU 2.0" up to
"Stable: ICU 2.8" (for UCOL_NUMERIC_COLLATION ).
So if we really wanted to have these functionalities with pre-54 ICU,
we could but that would mean implementing an interface to pass
to CREATE COLLATION the attributes/values we want to support.
Best regards,
--
Daniel Vérité
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