Halliday, 1978Halliday, : 130-131, 1996Halliday & Matthiessen, 2013: 48-49), supplementing the view "from above" -from contexts, with the views "from below" -from lexicogrammar and phonology (or graphology), and "from roundabout" -from the level of semantics itself, the level at which the variation takes place in the first instance (in terms of the "meanings at risk" in different contexts).
the project of registerial cartography includes centrally stratal coverage in the account of registers, from the contexts in which they operate to the linguistic strata where their semantic patterns are realized; stratal coverage thus includes a chain of inter-stratal realizations: context to semantics, semantics to lexicogrammar, and lexicogrammar to phonology or graphology (cf.