TITLE:		AN INTEGRATED APPROACH TO GENERATION USING SYSTEMIC
		GRAMMARS AND TREE ADJOINING GRAMMARS
AUTHOR:		Gijoo Yang
COMMENTS:	Ph.D. Thesis. Also UD CIS Tech Report 92-12

ABSTRACT:
Sentence generation is the process of going from some formal
specification of a set of goals to be achieved in language to an
English (or other natural language) sentence which achieves those
goals. This work explores a new approach to sentence generation that
incorporates two different perspectives on language: the functional
perspective exemplified in Systemic Grammar and the syntactic
perspective exemplified by a syntactic formalism called Tree Adjoining
Grammars (TAGs). Systemic grammars have concentrated on describing the
various functions to which language can be put and identifying how
sets of such functions should be expressed in the surface form of a
sentence. Syntactic theories using formalisms (such as TAG) have
focused on describing and manipulating the syntactic structures of
language in an effective way. In this work we bring these two
paradigms together recognizing that each focuses on a different aspect
of the generation process. The result is an elegant architecture and
processing strategy which reaps the benefits of both paradigms and yet
compromises neither.

The strategy we have developed places each of the paradigms to their
best advantage and maintains their independence. The functional
approach is used to decipher the input into a set of functional
choices that describe how the given input should be expressed in the
desired language. The actual realization of the desired sentence is
achieved by TAG structures (and composition operations). The focus of
this work has been a development of an architecture and processing
strategy that allows for the incorporation of two different
paradigms. The benefits of such an incorporation is discussed. The
feasibility of the developed strategies has been demonstrated by the
implemented system called ISOFT (Integrated System Of
Functional-systemics and TAGs).