"The Publisher receives a notification for any annotations made on their site which are explicitly published publicly. There are two proposed mechanisms for this:
1) a client-side event which informs the page of the annotation's publication URLs;
2) a server-side notification sent to the publisher's “well-known” contact address.
Either or both of these mechanisms may be used, each with its own use cases." https://www.w3.org/annotation/diagrams/annotation-architectu...
Read the W3C Recommendations for the protocol and data model. Neither has any mention whatsoever of a notification or alert:
https://www.w3.org/TR/annotation-protocol/
https://www.w3.org/TR/annotation-model/
Any type of notification would be an extra feature performed by annotation software, but is not a part of the specification.
Your annotation client could query the annotation server at a known endpoint for new annotations. The results should be ordered and paginated, but the order and pagination used seem to be at the discretion of individual implementations.
Not really.