Compositional Semantics for Linguistic Formalisms
			    Shuly Wintner

In what sense is a grammar the union of its rules? 
This paper adapts the notion of \textit{composition}, well developed
in the context of programming languages, to the domain of linguistic
formalisms. We study alternative definitions for the semantics of such
formalisms, suggesting a denotational semantics that we show to be
compositional and fully-abstract. This facilitates a clear,
mathematically sound way for defining grammar modularity.