something like this:
- Pointer: a bookmark with no additional content. Underlining. A bare quote.
- Note: a bookmark with some additional content. Marginalia. Adding something to the text, alongside it.
- Reference: a bookmark with a link to some other content. Adding something to the text, pointing elsewhere.
This seems simple, but it’s quite key, with regard to inline bookmarking. Then there’s the more general stuff associated with the whole text, or groups of texts.