Because Martin's model of genre as a level of context isn't theorised according to SFL principles — see for example arguments here here and/or here — components of the model are scattered across the architecture of SFL theory. For example:
- to the extent that genre refers to text type, it is a point of variation on the cline of instantiation: specifically, it is register viewed from the instance pole;
- to the extent that genre refers to the rôle of language in context, it is defined by features of the system of MODE, and so by the textual metafunction at the level of context;
- to the extent that genre refers to the sequence in which ideational and interpersonal meanings are organised, it is within the textual metafunction at the level of semantics.