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Polarized Unification Grammars

Abstract : This paper proposes a generic mathematical formalism for the combination of various structures: strings, trees, dags, graphs and products of them. The polarization of the objects of the elementary structures controls the saturation of the final structure. This formalism is both elementary and powerful enough to strongly simulate many grammar formalisms , such as rewriting systems, dependency grammars, TAG, HPSG and LFG.
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https://hal-univ-paris10.archives-ouvertes.fr/hal-02292741
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Sylvain Kahane. Polarized Unification Grammars. Coling-ACL, 2006, Sydney, Australia. ⟨10.3115/1220175.1220193⟩. ⟨hal-02292741⟩

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