canonical | commentary | quotation | reference | external |
Almost invariably, commentary links serve as side links rather than train of thought links. (Of course readers can later build paths which include commentary nodes, but this will generally not be the case for the original author's intended path.) On the other hand, normal links tend to be along the train of thought with the notable exceptions of citations and certain special cases of other normal links . . . (Trigg, n.p.)
Adrian Miles: Hypertext syntagmas: cinematic narration with links
A performative hypertext presented by Journal of Digital Information