Factoring Recursion and Dependencies: an Aspect of Tree Adjoining Grammars (Tag) and a Comparison of Some Formal Properties of Tags, GPSGs, Plgs, and LPGS

D u r i n g t h e l a s t few y e a r s t h e r e i s v i g o r o u s activity In constructing highly constrained grammatical systems by eliminating the transformational component either totally or partially. There is increasing recognition of t he f a c t t h a t the e n t i r e r a n g e o f d e p e n d e n c i e s t h a t t r a n s f o r m a t i o n a l g r a m m a r s i n t h e i r v a r i o u s i n c a r n a t i o n s have t r i e d t o a c c o u n t f o r c a n be satisfactorily captured by classes of rules that are non-transformational and at the same Clme highly constrlaned in terms of the classes of g r a m m a r s and l a n g u a g e s t h a t t h e y de f i n e .