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/** \brief Adds a collation URI.
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* The URI specifies the locale and collation strength of the collation that is added.
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* This prefix is followed by a collation strength (i.e. PRIMARY, SECONDARY, TERTIARY,
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* QUATTERNARY, or IDENTICAL) followed by a '/'.
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* After the strength a lower-case two- or three-letter ISO-639 language code must follow.
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* The URI may end with an upper-case two-letter ISO-3166.
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* specifies an english language with US begin the country..
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* Internally, ICU is used for comparing strings. For detailed description see