Are apposition markers discourse markers?

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Abstract
This paper aims to re-assess the notion DISCOURSE MARKER as it is applied to a subset of so-called apposition markers. It is argued that the classification of markers of reformulation as discourse markers alongside expressions like but and so is incoherent from a semantic point of view, since this ignores the distinction between PROCEDURAL and CONCEPTUAL meaning. Moreover, this classification is based on an account of discourse which is not only based on an insufficiently general account of context, but which is also difficult to maintain in the light of the use of these expressions in parenthetical nominal appositions. An alternative account is developed in the framework of Sperber & Wilson's Relevance Theory building on recent work on the meaning of parentheticals and sentence adverbials.