A background relation is an interpropositional relation in which one or more propositions are provided as information necessary for the proper understanding of some other proposition(s).
(English)
In the following construction, the first proposition provides background information for the second:
Matthiessen, Christian, and Sandra A. Thompson. 1987.The structure of discourse and 'subordination'. Marina del Rey, CA: Information Sciences Institute.
Mann, William C., and Sandra A. Thompson. 1987b.Rhetorical structure theory: A theory of text organization. Marina del Rey, CA: Information Sciences Institute.