Modularity and derivation in Functional Discourse Grammar

ABSTRACT Functional Discourse Grammar (FDG) is a typologically-based theory of language structure which is organized in levels, layers and components. In this paper, I will claim that FDG is modular in Sadock’s sense, as it presents four independent levels of representation with their own linguistic primitives each. For modular grammars, the relation between the different levels (more technically, the nature of the interfaces) is a central issue. It will be shown that FDG is a top-down grammar which follows two basic principles in its dynamic implementation: Depth-first and Maximal depth. Together with external constraints, these principles conspire to create linguistic representations which are psychologically adequate and which allow levels to be circumvented if necessary, thus simplifying representations and creating mismatches among them.