A logical approach to structure sharing in TAGs
نویسنده
چکیده
Tree adjoining grammars (TAG) represent a derivational formalism to construct trees from a given set of initial and auxiliary trees. We present a logical language that simultaneously describes the generated TAG-tree and the corresponding derivation tree. Based on this language we formulate constraints indicating whether a tree and a derivation tree mean a valid TAGgenerated tree. A method is presented that extracts the underlying TAG from an (underspecified) TAG-tree and its derivation. This leads to an alternative approach of representing shared structures by means of TAGs. The result is a more general representation of movement which requires no indices since it basically makes use of the properties of the adjunction operation.
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