{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "EvidenceRef Envelope (version 1)",
  "type": "object",
  "additionalProperties": false,
  "required": ["version", "source_revision", "view_digest", "node_id", "selector", "source_native_locator", "role", "visibility", "origin"],
  "properties": {
    "version": { "const": 1 },
    "source_revision": { "type": "string" },
    "view_digest": { "type": "string", "pattern": "^[0-9a-f]{64}$" },
    "node_id": { "type": "string" },
    "selector": {
      "oneOf": [
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["kind"],
          "properties": { "kind": { "const": "whole_node" } }
        },
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["kind", "unit", "start", "end"],
          "properties": {
            "kind": { "const": "bounded_subrange" },
            "unit": { "const": "unicode_scalar" },
            "start": { "type": "integer", "minimum": 0 },
            "end": { "type": "integer", "minimum": 1 }
          }
        }
      ]
    },
    "source_native_locator": { "type": "object" },
    "role": { "type": "string", "enum": ["requirement", "supporting", "interpretation"] },
    "visibility": { "type": "string", "enum": ["all", "collaborative_pass"] },
    "origin": { "type": "string", "enum": ["room_captured", "agent_supplied"] }
  }
}