Reference: Ted Nelson Links
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The exact specification of the Ted Nelson links is described at Project Xandu (archival copy, local copy). 

A derivative of the Ted Nelson linking system might be that the links are ordinary auto-generated web links that point to a collection of documents that are somehow related to the visual object (text, image, etc.) that has been automatically converted to be a link. Some of those objects might be labeled by the author as the source of the visual object that links to the collection of documents and that the author uses as a citation.

Ted Nelson Related References