It commonly assumed that the interpret-ation of nonrestrictive relative clauses relies on some sort of coreference between the head and the 'wh'-phrase in the rela-tive clause. I will show that this assump-tion is not correct, and give an account
of the interpretation of nonrestrictive relative clauses that incorporates some
of the insights of the Discourse Represen-tation Theory of Hans Kamp (A Theory of Truth and Semantic Representation. In
J. Groenendijk, T. Jansen, and M. Stokhof
(eds.), "Truth, Interpretation and Inform-ation." Dordrecht: Foris, 1-41). I also discuss the similarities in interpretation
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that we find with regular pronominal anaphora, including the phenomena that I call 'modal subordination' and 'temporal
subordination.' I believe that this shows that the right level to express the relation between the head and nonre-strictive adjunct is neither by indexing
in the syntax nor by actual reference in
a world or model, but at an intermediate level of discourse structure of the sort propsed by Kamp. This provides further support for the idea that there is a level of linguistic representation larger than the sentence at which such relations of discourse structure are charterized.