SNePS As A Network-Based System
As a network-based system, SNePS is a propositional semantic network, thus the original meaning of "SNePS" as "The Semantic Network Processing System". This view is obtained by considering every individual constant and every functional term to be a node of the network, and every slot to be a directed labeled arc from the frame-node it is in to every node in its filler. In the intended interpretation, every node denotes a mental entity, some of which are propositions, and every proposition represented in the network is represented by the node that denotes it. Some nodes are variables of the SNePS logic, and they range over nodes, and only over nodes.
Path-based inference rules may be defined, although they, themselves, are not represented in SNePS. A path-based inference rule specifies that some labeled arc r may be inferred as present from some node n to some other node m just in case a given path exists from n to m. There is an extensive recursive set of path constructors available.
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