The relationship of SPEECH FUNCTION to MOOD mediated by interpersonal metaphor is precisely parallel to that between CONJUNCTION and the clause complex as mediated by ideational metaphor. Because of this it was possible to present a register neutral description of the semantics of dialogue in Chapter 2, just as it was possible to produce a register neutral description of conjunctive relations in Chapter 4. Both these types of organic relation are essential components of English text forming resources and need to be interpreted systematically as semantic systems in language, not as register specific features of context.
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Midway between potential and instance, sets of such strategies cluster within ranges of tenor values. Such a cluster is the interpersonal analogue of a domain in the ideation base: it is a region within the overall interpersonal space of meaning, selected according to tenor, just as a domain is a region within the overall ideational space of meaning, selected according to field. The options in interpersonal meaning that make up the cluster together enact a tenor relationship … We might call such a cluster an exchange relationship to foreground that it is semantic (i.e. constituted in meaning through exchanges of meaning) and that it is interpersonal (rather than one-sidedly personal). To indicate that it is analogous to a domain model, we might have called it an exchange or interaction “model”; but we have avoided that term because it suggests a construal of something and construal is the ideational mode of meaning — it is more like a protocol than a model.
These devices are ORGANIC; the terms in the tie are whole message(s) rather than message components…