Answer: The idea of semantic networks started out as a natural way to represent
labelled connections between entities. But, as the representations are expected
to support increasingly large ranges of problem-solving tasks, the
representation schemes necessarily become increasingly complex. In particular,
it becomes necessary to assign more structure to nodes, as well as to links.
For example, in many cases we need node labels that can be computed, rather
than being fixed in advance. It is natural to use database ideas to keep track
of everything, and the nodes and their relations begin to look more link
frames.
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