{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://openeik.org/schemas/0.1/proposed/grain/main-direction.schema.json",
  "$comment": "Proposed for OpenEik 0.2: Part II, 5.1.1, rules 2 and 4. Written by hand, not generated. In 0.1, mainDirection is a member the element schema does not know, kept; a validator holds it to this schema only when asked for the proposal (@openeik/tools: proposals [\"grain\"]).",
  "title": "A slab's, a ceiling's, a foundation's or a roof's main direction",
  "description": "The direction its layers' grain is told from, in degrees counter-clockwise in plan from the model's x axis, read modulo 180 (Part II, 5.1.1, rules 2 and 4). A slab, a ceiling or a foundation with panels has its main direction square to their direction, and where it carries both they agree; a roof's every face takes it, projected vertically onto its plane.",
  "type": "number"
}