The text is a product in the sense that it is an output, something that can be recorded and studied, having a certain construction that can be represented in systematic terms. It is a process in the sense of a continuous process of semantic choice, a movement through the network of meaning potential, with each set of choices constituting the environment for a further set.

Halliday (1985) cited in: Xueyan Yang (2010) Modelling Text As Process. p. 20.