{
  "xrai_version": "1.0",
  "id": "00000000-0000-4000-a000-000000000007",
  "created_at": "2026-04-23T00:00:00Z",
  "author": {"type": "human", "id": "example"},
  "origin": {"app": "portals", "version": "v4", "scene": "SimpleAR"},
  "metadata": {
    "description": "Persistent location-based scene. Anchored to a world map point, reloadable across sessions + devices.",
    "persistence": {
      "provider": "arkit.worldmap",
      "fallback": "google.cloud-anchor",
      "geolocation": {"lat": 40.7128, "lon": -74.0060, "alt_m": 10, "accuracy_m": 2.0}
    }
  },
  "scene": {
    "anchors": [
      {
        "id": "anchor_persistent",
        "type": "ar.worldmap",
        "metadata": {
          "map_uri": "portals://worldmap/abc123",
          "created_by": "user_42",
          "created_at": "2026-04-20T14:00:00Z",
          "resolved_confidence": 0.88
        }
      }
    ],
    "entities": [
      {
        "id": "monument_cube",
        "type": "object.primitive",
        "model_id": 0,
        "transform": {
          "position": [0, 0.25, -1.5],
          "rotation": [0, 0, 0, 1],
          "scale": [0.5, 0.5, 0.5]
        },
        "material": {"color": "cyan", "preset": "neon"},
        "metadata": {"editable": true, "remixable": true}
      }
    ],
    "relations": [
      {"id": "r_mon_anchor", "type": "tracks", "from": "monument_cube", "to": "anchor_persistent", "props": {}}
    ],
    "events": [
      {"id": "e_save", "t": "2026-04-20T14:00:00Z", "type": "scene.saved", "entity": null, "metadata": {"by": "user_42"}},
      {"id": "e_load", "t": "2026-04-23T00:00:00Z", "type": "scene.loaded", "entity": null, "metadata": {"by": "example", "relocalized": true}}
    ]
  }
}