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# collation

The string sort order of the locale.

```
var collation: Locale.Collation { get }
```

## Discussion

This property corresponds to the `co` key of the Unicode BCP 47 extension.

For locale instances created with the `co` specifier (such as `en-US@co=phonetic`), or with a custom [`Locale.Components`](/documentation/Foundation/Locale/Components), this property represents the custom collation. Otherwise, it represents the locale’s default sort order.

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