From a conversation at breakfast:
Does the concept of hierarchy come naturally to the reader of, say, a novel?
Lynne Price says yes the hierarchy is self-evident; Peter Flynn & I believe there are pre-formal notions in the minds of readers that lead fairly easily to understanding documents as hierarchies, but that this is a separate step of formal understanding that emerges or is cultivated (eg in introductory XML training) from pre-formal notions.
Other views?
Addressed in Allen Renear's latebreak
Difference between expression and licensed inferences - where licensing of inferences is well known to depend on an underlying logic.