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# Encoding and Decoding Attributed String Keys

Protocols adopted by attribute keys to encode or decode data.

## Topics

### Encoding and Decoding Keys

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

A protocol that defines how an attribute key decodes its value.

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

A protocol that defines how an attribute key encodes its value.

[`typealias CodableAttributedStringKey`](/documentation/Foundation/CodableAttributedStringKey)

A type alias used by attribute keys that are both encodable and decodable.

### Markdown Keys

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

A protocol that defines how an attribute key decodes a value that corresponds to Markdown syntax.


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