solid-notifications

Objectives : apply solid-notifications protocol https://solid.github.io/notifications/protocol
and compatibility with CSS implementation https://github.com/CommunitySolidServer/CommunitySolidServer/documentation/markdown/usage/notifications.md

• discovery subscription service : link header (relative URL ?)
  link: <.well-known/solid-notifications>; rel="http://www.w3.org/ns/solid/terms#storageDescription"
• turtle subscription service document (if turtle relative ?)
  - [ ] WebSocketChannel2023 : podRoot/.notifications/WebSocketChannel2023/
  - [ ] WebHookChannel2023 : podRoot/.notifications/WebHookChannel2023/
• subscription
  - [ ] authenticated json-ld POST
  - [ ] read followed item
  - [ ] json-ld response (contains subscription URL)
• default duration of the subscription URL) : 2 weeks (?)
• unsubscribe : DELETE the subscription url received in the subscription response (no need to be authenticated)
• notifications messages json-ld
  - [ ] notification types
  - [ ] extra features

Start by comparing the Solid Notifications protocol with the linked CommunitySolidServer compatibility documentation, then map each checklist item to the existing notification-related code in node-solid-server. Done means implementing and testing discovery, subscription, channel documents, unsubscribe behavior, duration, and JSON-LD notification messages, including the listed notification types and features.