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Here's an example of a story grammar, taken from Thorndyke [1]. That which flanks `+' comes sequentially; the asterisk indicates indefinite repetition; parentheses enclose that which is optional; brackets attach to mutually exclusive elements (as I remember).

tabular5

Here's what Thorndyke had to say about this sort of grammar and frame-based KR:

The domain of stories described by [this grammar] may be conceptualized as comprising a `frame' that encodes the invariant structure common to all exemplars of the domain. The components of the frame, the abstract story elements, are `slots' that become instantiated according to the grammar with the specific details or content of the particular story in question. During comprehension of a story, the frame for general `stories' produces a description of the current story by substituting real properties of the story for prototypical ones provided by the frame tex2html_wrap_inline102 In this way, general frames encoding the story grammar are used to produce the representation of a particular story conforming to that grammar ([1], 107).




Selmer Bringsjord
Mon Nov 4 13:13:53 EST 1996