The idea to create a visual prompt to remind us of the fact that an original context may differ from the way in which an excerpt is being used is a compelling solution to Nicholas Carr's 'context collapse' [1].
Another interesting approach is through the Webmention [2].
These are ways to promote the augmentative - and relational - thinking Engelbart promoted.
To this conversation I would also add the question of how to make interrelational writing sustainable.
[1]
http://www.roughtype.com/?p=8724
[2]
https://indieweb.org/webmention