{
  "type": "object",
  "properties": {
    "dependencies": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "scene_index": {"type": "integer"},
          "shot_index": {"type": "integer"},
          "location_refs": {
            "type": "array",
            "maxItems": 1,
            "description": "At most 1 previous shot reference for background continuity",
            "items": {
              "type": "object",
              "properties": {
                "scene_index": {"type": "integer"},
                "shot_index": {"type": "integer"},
                "reason": {"type": "string", "description": "Brief reason for this reference"}
              },
              "required": ["scene_index", "shot_index", "reason"],
              "additionalProperties": false
            }
          }
        },
        "required": ["scene_index", "shot_index", "location_refs"],
        "additionalProperties": false
      }
    }
  },
  "required": ["dependencies"],
  "additionalProperties": false
}