# ArchiveHeader.EntryXATBlob.ExtendedAttribute A structure that describes the extended attributes of a filesystem. ``` struct ExtendedAttribute ``` ## Topics ### Creating an Extended Attribute [`init(key: String, data: ContiguousArray)`](/documentation/AppleArchive/ArchiveHeader/EntryXATBlob/ExtendedAttribute/init(key:data:)) Creates a new extended attribute structure. ## Relationships ### Conforms To [`Equatable`](/documentation/Swift/Equatable) [`Hashable`](/documentation/Swift/Hashable) [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)