{
  "description": "OpenContainer Content Descriptor Specification",
  "$schema": "http://json-schema.org/draft-04/schema#",
  "id": "https://opencontainers.org/schema/descriptor",
  "type": "object",
  "properties": {
    "mediaType": {
      "description": "the mediatype of the referenced object",
      "$ref": "defs-image.json#/definitions/mediaType"
    },
    "size": {
      "description": "the size in bytes of the referenced object",
      "$ref": "defs.json#/definitions/int64"
    },
    "digest": {
      "description": "the cryptographic checksum digest of the object, in the pattern '<hash>:<hexadecimal digest>'",
      "$ref": "defs-image.json#/definitions/digest"
    },
    "urls": {
      "description": "a list of urls from which this object may be downloaded",
      "type": "array",
      "items": {
        "type": "string",
        "format": "uri"
      }
    }
  },
  "required": [
    "mediaType",
    "size",
    "digest"
  ]
}