Misrepresenting Halliday's Semantic System Of Speech Function As Martin's Discourse Semantic System

Martin & Rose (2007: 251, 252):

As far as the realisation of SPEECH FUNCTION in MOOD is concerned, we noted the important role played by indirect speech acts (Halliday’s mood metaphors) as far as expanding the meaning potential available for speakers to negotiate within dialogue. The major MOOD options for the English clause are outlined in Figure 7.5. Technically speaking, speech function is a discourse semantic system realised through the grammar of mood (including vocation, tagging, modality and polarity which are not included in Figure 7.5).

 

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[1] Cf Halliday & Matthiessen (2014: 162):

[2] This is misleading, because it misrepresents Halliday's semantic system of speech function as Martin's discourse semantic system. As previously noted, the authors have not acknowledged Halliday as the intellectual source of the system of speech function, anywhere in this chapter.