E.g. I add the keywords "Permutations, Combinations" to the "Name" field of a bunch of Bookmarks. I have now crosslinked the Bookmarks. So while it may not be

E.g. I add the keywords "Permutations, Combinations" to the "Name" field of a bunch of Bookmarks. I have now crosslinked the Bookmarks. So while it may not be exactly what the linked OP article is talking about, it's a way of storing knowledge, linked via horizontal relationships. But whatever floats your boat.