{
    "types": {
        "instance": {
            "id": "T[integer] | T[string]",
            "bbox": "T[bbox]",
            "confidence": "? : T[float]",
            "angle": "? : T[float]",
            "category_id": "? : T[integer] | T[string]",
            "polygons": "? : [T[polygon]]",
            "area": "? : T[float]",
            "extra_information": "? : T[object]"
        },
        "bbox": "T[float_quad]",
        "image": {
            "width": "T[integer]",
            "height": "T[integer]",
            "id": "T[integer] | T[string]",
            "format": "? : T[string]",
            "file_name": "? : T[string]"
        },
        "model": {
            "name": "? : T[string]",
            "uuid": "? : T[UUIDv4]"
        },
        "context": {
            "timestamp": "? : T[ISO]",
            "longitude": "? : T[float]",
            "latitude": "? : T[float]",
            "crs": "? : T[integer] | T[string]",
            "tag_list": "? : [T[string]]",
            "group_name": "? : T[string]",
            "group_id": "? : T[integer]"
        },
        "inference": {
            "timestamp": "? : T[ISO]",
            "config": "? : T[object]"
        },
        "polygon": [
            "T[float_pair]"
        ]
    },
    "enums": {},
    "structure": {
        "instances": [
            "T[instance]"
        ],
        "image": "T[image]",
        "model": "? : T[model]",
        "inference": "? : T[inference]",
        "context": "? : T[context]",
        "ir_name": "T[string](\"ISIR\")",
        "ir_id": "T[integer](1)",
        "extra_information": "? : T[object]"
    },
    "notes": {
        "bbox": "We use xywh: center coordinates and width/height - not normalized. Coordinate system has origin (0,0) at bottom-left, and top-right is (width, height).",
        "angle": "Rotation in radians, counterclockwise from the positive x-axis in the bottom-left coordinate system. bbox width follows the rotated x-axis and height its perpendicular; the center is unchanged. Omitted angle means zero. Equivalent width/height swaps with a quarter-turn describe the same box.",
        "uuid": "We use UUIDv4, see: https://datatracker.ietf.org/doc/html/rfc9562.html#section-5.4",
        "ISO": "We use ISO 8601 (YYYY-MM-DDTHH:mm:ss.sssZ), see: https://www.iso.org/iso-8601-date-and-time-format.html",
        "crs": "We suggest using EPSG codes, either specified as an integer or 'EPSG:XXXX'. Proj string can also be used.",
        "numbers": "Image dimensions, numeric IDs, ir_id and group_id are integers; numeric CRS values are integer EPSG codes.",
        "image_formats": "No image-format allowlist has been supplied. image.format remains an unrestricted string until the options for E[image_formats] are defined.",
        "polygons": "Optional polygon rings as lists of [x,y] pairs, in the same original-image, bottom-left coordinate system as boxes. Holes and raster RLE are not implicitly converted to polygons.",
        "category_id": "Producer category ID; interpretation requires the source vocabulary. IDs are not automatically remapped between vocabularies.",
        "area": "Optional source-reported area, in pixel-square units. It is not automatically recomputed from a box or contour.",
        "extra_information": "Per-record and per-instance namespaced adapter fields preserve native details without making them universal IR concepts.",
        "compatibility": "ir_name=\"ISIR\" and ir_id=1 identify this data IR contract, not an individual prediction. Unknown versions must be handled explicitly.",
        "scope": "One ISIR record describes detections on exactly one image. Multi-image adapters return a collection of these records; dataset-level metadata may be retained separately from the per-image records."
    }
}