[icu-design] CLDR/ICU proposal: collation rules for import only

[Markus Scherer]

In CLDR team discussion today we settled on a more obvious, less "ugly"
naming convention, using a two-part type that turns into two language
subtags.

In CLDR data:
    <collation type="private-kana">
        <cr>...

    <collation type="standard">
        <import source="ja" type="private-kana">
        <cr>...

which in ICU would turn into
    [import ja-u-co-private-kana]

Multi-part keyword values are already used for ca (calendar type e.g.
islamic-tbla), kr (script reodering), vt (deprecated variableTop) and maybe
more.

Thanks for the feedback!
markus
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