Principles

The best current guess for a reader nobody knows, one file per principle, grouped by the scale it acts on. Each file follows the same shape: the claim, its grade, the evidence, the check that enforces it, the reader styles that override it; then what it asks, why, and its limits.

Facet	Scale
collection/	how content is cut into files and arranged in folders
document/	the order and depth of one document
sentence/	how information is packed into sentences
page/	figures, layout and type on the page

The claims and grades of all of them, in one table, are in the standard.