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-

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-protocol/ https://www.w3.org/TR/annotation-model/ 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.