A small observation
A useful notebook keeps the source intact while making room for a reader’s response. The highlight is an address into the text, not a markup change to the published document.
When a passage moves, its exact words and nearby context can recover a unique anchor. If the source becomes ambiguous or disappears, the saved note says so instead of attaching itself to an arbitrary sentence.
Exported notes use the W3C Web Annotation shape with plain text bodies. Import only restores notes for this page; it does not publish or share anything with another reader.