# MarkupID An opaque ID for markup elements. ``` struct MarkupID ``` ## Topics ### Creating an ID [`init()`](/documentation/PaperKit/MarkupID/init()) Creates a new unique ID. ### Converting IDs [`enum ElementID`](/documentation/PaperKit/MarkupOrderedSet/ElementID) The markup ID types supported in a markup ordered set. ## Relationships ### Conforms To [`RawRepresentable`](/documentation/Swift/RawRepresentable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Encodable`](/documentation/Swift/Encodable) [`Sendable`](/documentation/Swift/Sendable) [`Equatable`](/documentation/Swift/Equatable) [`Hashable`](/documentation/Swift/Hashable) [`Decodable`](/documentation/Swift/Decodable) --- 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)