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# Attributed String Supporting Types

Types that the attributed string, attributed substring, and helper types extend or conform to, for sharing common functionality.

## Topics

### Shared Attributed String Functionality

[`protocol AttributedStringProtocol`](/documentation/Foundation/AttributedStringProtocol)

A protocol that provides common functionality to attributed strings and attributed substrings.

### Defining Attribute Scopes

[`protocol AttributeScope`](/documentation/Foundation/AttributeScope)

A type that organizes attributes into a grouping, and supports dynamic member lookup and serialization of attribute keys.


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