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Typed links, while not really a part of Internet/HTML based hypertext systems were a common feature in pre-Internet hypertext systems such as Xanadu, NoteCards?, HyperWriter?, IBIS/gIBIS and others. While typed links can be very useful, the lack of a standardized set of link attributes such as "Supports Position"/"Refutes Position" as well as the difficulty of applying the attributes has always hindered the use typed links beyond prototyping purposes. |
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