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Documentation: reference/reference_lua/box_space/_collation

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	box.space._collation
	``_collation`` is a system space with a list of :ref:`collations <index-collation>`. There are over 270 built-in collations and users may add more. Here is one example:
	tarantool> box.space._collation:select(239) --- - - [239, 'unicode_uk_s2', 1, 'ICU', 'uk', {'strength': 'secondary'}] ...
	Explanation of the fields in the example: id = 239 i.e. Tarantool's primary key is 239, name = 'unicode_uk_s2' i.e. according to Tarantool's naming convention this is a Unicode collation + it is for the uk locale + it has secondary strength, owner = 1 i.e. :ref:`the admin user <authentication-owners_privileges>`, type = 'ICU' i.e. the rules are according to `International Components for Unicode <http://site.icu-project.org/home>`_, locale = 'uk' i.e. `Ukrainian <http://www.unicode.org/cldr/charts/29/collation/uk.html>`_, opts = 'strength:secondary' i.e. with this collation comparisons use both primary and secondary `weights <https://unicode.org/reports/tr10/#Weight_Level_Defn>`_.
	The :ref:`system space view <box_space-sysviews>` for ``_collation`` is ``_vcollation``.

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