{"type":"ScholarlyArticle","title":"Charts, Interaction-free Grammars, and the Compact Representation of Ambiguity","authors":[{"name":"Marc Dymetman","slug":"marc-dymetman","given":"Marc","family":"Dymetman","affiliation":""}],"abstract":"Recently researchers working in the LFG framework have proposed algorithms for taking advantage of the implicit context-free components of a unification grammar [Maxwell and Kaplan, 19961 This paper clarifies the mathematical foundations of these techniques, provides a uniform framework in which they can be formally studied and eliminates the need for special purpose runtime datastructures recording ambiguity. The paper posits the identity: Ambiguous Feature Structures = Grammars, which states that (finitely) ambiguous representations are best seen as unification grammars of a certain type, here called \"interactionfree\" grammars, which generate in a backtrackfree way each of the feature structures subsumed by the ambiguous representation. This work extends a line of research [Billot and Lang, 1989; Lang, 1994] which stresses the connection between charts and grammars: a chart can be seen as a specialization of the reference grammar for a given input string. We show how this specialization grammar can be transformed into an interaction-free form which has the same practicality as a listing of the individual solutions, but is produced in less time and space.","doi":null,"url":"https://ijcai.org/proceedings/1997/145","pdf":"https://ijcai.org/proceedings/1997/0145.pdf","markdown":"https://ijcai.org/proceedings/1997/145.md","bibtex":"https://ijcai.org/proceedings/1997/bibtex/145","volume":{"slug":"1997","title":"Proceedings of the Fifteenth International Joint Conference on Artificial Intelligence","short_title":"IJCAI 1997","url":"https://ijcai.org/proceedings/1997/","year":1997,"location":"Nagoya, Japan","dates":"","editors":"Martha E. Pollack","isbn":"","publisher":"International Joint Conferences on Artificial Intelligence","doi_prefix":""},"section":"Natural-language Processing and Graphical Presentation","track":"Natural-language Processing and Graphical Presentation","number":145,"pages":{"first":1002,"last":1008},"keywords":[],"videos":[],"references":[],"license_note":"Copyright International Joint Conferences on Artificial Intelligence."}