Infrastructure is a way to organize inclusion/exclusion. (Offray
via matrix 
) See Inclusion/Exclusion (Inklusion/Exklusion) and Pocket Infrastructures.
The difference between inclusion and exclusion refers to the way in which a society permits individuals to be persons and therefore to participate in communication.
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For me the meaning of infrastructure is preconditioned by the domain. It simply means essential support to the key functioning of the domain. In the Linkage Mapping approach I would make "infrastructure" show up as a synonym of "support".