Halliday & Matthiessen (2014: 45):
In describing the structure of the text, we have foregrounded the perspective of the ideational metafunction. Sequences are construed through logical resources and figures through experiential ones; and rhetorical paragraphs and groups of paragraphs can be interpreted as being formed by logical resources – in terms of logico-semantic relations (cf. Halliday, 2001; Matthiessen, 2002a). At the same time, texts are also organised in terms of interpersonal and textual patterns of meaning.