first came across this.
‘Shared Web annotations include provenance, so they will always have a link back to its original URL, and even a chain of attribution that shows everyone who shared it in a sequence. This is an important way to spread content while rewarding the original Content Creator.’
Interactive SVG-diagram/slides that describe the Web annotation architecture https://www.w3.org/annotation/diagrams/annotation-architecture.svg
The W3C Web Annotation Working Group https://www.w3.org/annotation/
Web Annotation Vocabulary https://www.w3.org/TR/annotation-vocab/
Web Annotation Data Model https://www.w3.org/TR/annotation-model/