CartoDB/cartodb20

{
  "type": "object",
  "required": ["type", "location", "identifier"],
  "additionalProperties": false,
  "properties": {
    "type": {
      "description": "Describes in what service the asset is hosted in",
      "enum": ["s3", "local"]
    },
    "location": {
      "description": "The sub-level in which the asset is located (i.e: bucket, subdirectory)",
      "type": "string"
    },
    "identifier": {
      "description": "Must identify an asset within a location uniquely (i.e: full path)",
      "type": "string"
    }
  }
}