Halliday & Matthiessen (2014: 650):
We have identified the following features as those which combine to make up the textual resources of the lexicogrammar of English:(A) structural1 thematic structure: Theme and Rheme
2 information structure and focus: Given and New
(B) cohesive1 conjunction
2 reference
3 ellipsis (that is, ellipsis and substitution)
4 lexical cohesion