It is part of the task of linguistics to describe texts, and all texts, including those prose or verse, which fall within any definition of literatur… - Michael Halliday

A physical system is just that: a physical system. What is systematized is matter itself, and the processes in which the system is realized are also material. But a biological system is more complex: it is both biological and physical — it is matter with the added component of life; and a social system is more complex still: it is physical, and biological, with the added component of social order, or value. … A semiotic system is still one step further in complexity: it is physical, and biological, and social —and also semiotic: what is being systematized is meaning. In evolutionary terms, it is a system of the fourth order of complexity

Traditionally, grammar has always been a grammar of written language: and it has always been a product grammar" ['Product' is here used as one term of the Hjelmslevian pair process/product.] A process/product distinction is a relevant one for linguists because it corresponds to that between our experience of speech and our experience of writing: writing exists whereas speech happens.

Foregrounding, as I understand it, is prominence that is motivated