In confluence (wiki software from Atlassian) there is an “excerpt” feature that lets you do “transclusions”.
You mark one part of a page as “excerptable” and then from any other page you can “include” that “excerpt”.
It’s quite neat. Helps you have the same content reused and reordered in different ways.
... the ability to link to sections of a text ...
That sounds like #transclusions which is a fundamental principle of #Xanadu.
#Metawiki offers something similat, though it's not seamless / friction-free.
@ben @sir like something with headings, a few styles for marking text, formula, images and image galeries with suggestions float/left/right or take horizontal space, also potentially used for side-text.
Notes, references.
And of course links. Harder to implement, but pieces of texts being able to link to other pieces of texts, so people can visibly connect side-by-side. #transclusions
Like Ted Nelsons #Xanadu but i don't know if his approach checks the other boxes. https://www.youtube.com/watch?v=hMKy52Intac
