An alternative description of extractions in TAG KAHANE

The only description of extractions in TAG we know has been developed by Kroch & Joshi (1986), Kroch (1987) and implemented in the developed grammars of English (XT AG 1995) and French (Abeille 1991, Candito 1999). This implementation sol ves the unboundedness of extractions with predicative adjoining, but the pied-piping is solved using a special feature. We think that this solution of pied-piping is not absolutely convenient, because some edge of the derivation tree cannot be interpreted as semantic dependency (Candito & Kahane 1998). Our assumption is based on the fact that a TAG derivation tree can be interpreted as a semantic graph, that is a predicate-argument structure. Moreover this implementation fails to describe some cases of extraction, such as some French dont-relatives. We propose a new description of extraction in TAG which solve most of these problems. Nevertheless, our study must rather be appreciated as an investigation of the limits of the TAG formalism, because we think that TAG is not the most appropriate framework for the implementation of our description of extractions. Tue same analysis is more suitably implemented in GAG/DTG (Candito & Kahane 1998). i. Semantic dependencies