UAX44: loose matching of symbolic values and the `is` prefix

Markus Scherer at
Mon Jun 6 11:09:11 CDT 2016

Interesting discussion!

ICU does not support "is" nor "in" prefixes. I wasn't even aware that UAX
#44 loose matching prescribes "is". ICU just implements what
Property[Value]Aliases.txt say:

# Loose matching should be applied to all property names and property
values, with
# the exception of String Property values. With loose matching of
property names and
# values, the case distinctions, whitespace, hyphens, and '_' are ignored.

The prefixes seem gratuitous and confusing. For example, if I
read UAX44-LM3 right, it would allow [:isscript=isgreek:].

We do support just [:Greek:] for scripts and [:L:] for general categories.

I would rather not add support for the prefixes in ICU.

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