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The paper introduces a grammar formalism for defining the set of sentences in a language, a set of labeled trees (not the derivation trees of the grammar) for the representation of the interpretation of the sentences, and the (possibly non-projective) correspondence between subtrees of each tree and substrings of the related sentence. The grammar formalism is motivated by the linguistic approach (adopted at GETA) where a multilevel interpretative structure is associated to a sentence. The topology of the multilevel structure is 'meaning' motivated, and hence its substructures may not correspond projectively to the substrings of the related sentence. . | STRING-TREE CORRESPONDENCE GRAMMAR A DECLARATIVE GRAMMAR FORMALISM FOR DEFINING THE CORRESPONDENCE BETWEEN STRINGS OF TERMS AND TREE STRUCTURES YUSOFF ZAHARIN Groupe d Etudes pour la Traduction Automatlque B.p. n 68 Université de Grenoble 38402 SAINT-MARTIN-D HERES FRANCE ABSTRACT The paper introduces a grammar formalism for defining the set of sentences in a language a set of labeled trees not the derivation trees of the grammar for the representation of the interpretation of the sentences and the possibly non-pro-jective correspondence between subtrees of each tree and substrings of the related sentence. The grammar formalism is motivated by the linguistic approach adopted at GETA where a multilevel interpretative structure is associated to a sentence. The topology of the multilevel structure is meaning motivated and hence its substructures may not correspond projactively to the substrings of the related sentence. Grammar formalisms have been developed for various purposes. Generative-Transformational Grammars General Phrase Structure Grammars Lexical Functional Grammar etc. were designed to be explanatory models for human language performance while others like the Definite Clause Grammars were more geared towards direct interpretability by machines. In this caper we introduce a declarative grammar formalism for the task of establishing the relation between on one hand a set of strings of terms and on the other a set of structural representations -a structural representation being in a form amenable to processing say for translation into another language where all and only the relevant contents or meaning in some sense adequate for the purpose of the related string are exhibited. The grammar can also be interpreted to perform analysis given a string of terms to produce a structural representation capturing the meaning of the string or to perform generation given a structural representation to produce a string of terms whose meaning Is captured by the said .
