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- https://github.com/fcrepo/fcrepo-adopters-guide/blob/master/docs/messaging.md
- Emit message for synthetic triples added/removed
- Emit message for each resource deleted in a hierarchy
- 6.3
- uses JSON-LD format for serialization
- The notification serialization must conform to the [activitystreams-core] specification.
- Wherever possible, data should be expressed using the [activitystreams-vocabulary].