{
  "description": "OpenContainer Image Index Specification",
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "https://opencontainers.org/schema/image/index",
  "type": "object",
  "properties": {
    "schemaVersion": {
      "description": "This field specifies the image index schema version as an integer",
      "id": "https://opencontainers.org/schema/image/index/schemaVersion",
      "type": "integer",
      "minimum": 2,
      "maximum": 2
    },
    "mediaType": {
      "description": "the mediatype of the referenced object",
      "$ref": "defs-descriptor.json#/definitions/mediaType"
    },
    "artifactType": {
      "description": "the artifact mediatype of the referenced object",
      "$ref": "defs-descriptor.json#/definitions/mediaType"
    },
    "subject": {
      "$ref": "content-descriptor.json"
    },
    "manifests": {
      "type": "array",
      "items": {
        "id": "https://opencontainers.org/schema/image/manifestDescriptor",
        "type": "object",
        "required": [
          "mediaType",
          "size",
          "digest"
        ],
        "properties": {
          "mediaType": {
            "description": "the mediatype of the referenced object",
            "$ref": "defs-descriptor.json#/definitions/mediaType"
          },
          "size": {
            "description": "the size in bytes of the referenced object",
            "$ref": "defs.json#/definitions/int64"
          },
          "digest": {
            "description": "the cryptographic checksum digest of the object, in the pattern '<algorithm>:<encoded>'",
            "$ref": "defs-descriptor.json#/definitions/digest"
          },
          "urls": {
            "description": "a list of urls from which this object may be downloaded",
            "$ref": "defs-descriptor.json#/definitions/urls"
          },
          "platform": {
            "id": "https://opencontainers.org/schema/image/platform",
            "type": "object",
            "required": [
              "architecture",
              "os"
            ],
            "properties": {
              "architecture": {
                "id": "https://opencontainers.org/schema/image/platform/architecture",
                "type": "string"
              },
              "os": {
                "id": "https://opencontainers.org/schema/image/platform/os",
                "type": "string"
              },
              "os.version": {
                "id": "https://opencontainers.org/schema/image/platform/os.version",
                "type": "string"
              },
              "os.features": {
                "id": "https://opencontainers.org/schema/image/platform/os.features",
                "type": "array",
                "items": {
                  "type": "string"
                }
              },
              "variant": {
                "type": "string"
              }
            }
          },
          "annotations": {
            "id": "https://opencontainers.org/schema/image/descriptor/annotations",
            "$ref": "defs-descriptor.json#/definitions/annotations"
          }
        }
      }
    },
    "annotations": {
      "id": "https://opencontainers.org/schema/image/index/annotations",
      "$ref": "defs-descriptor.json#/definitions/annotations"
    }
  },
  "required": [
    "schemaVersion",
    "manifests"
  ]
}