Catalogue of Artificial Intelligence Techniques

   

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Predictive Parsing

Aliases: Expectation-based Parsing

Keywords: parsing

Categories: Natural Language


Author(s): Karen Sp\"arck Jones

Predictive parsing is an approach to natural language analysis based on the use of powerful programs associated primarily with individual lexical items which embody expectations about the form and content of the subsequent sentence/text input. The expectations are intended to determine the analysis of further inputs by providing semantic structures into which they must fit. (These structures may be those of Preference Semantics, Conceptual Dependency, or, by generalisation, Scripts.) The essentially word-driven basis, and emphasis on semantic rather than syntactic information and processing, of this style of parsing makes it predictive in a very different sense from that of classical top-down syntactic parsing; and allowing the exploitation of any type or piece of information in a word program offers great flexibility. The price includes a lack of generality, and overlaps or gaps between individual programs. The approach is therefore best suited to domain-limited language processing. The main application of expectation-based parsing has been in the extraction of conceptual dependency structures from English; the technique has also been generalised in the direct application of scripts to parsing. Word expert parsing is a specialisation of this approach confined to word-based expectations, but not restricted to left-to-right operation.


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