/**
 * A copy is the digital counterpart of a work.
 * It corresponds to a unique file or set of files which represent the work on the users device.
 *
 * Multiple works can have multiple copies (think of different scans of a physical work, or lossy compression).
 */
interface CopyInterface extends IdentifiableInterface {
  /**
   * the work this entity is a copy of
   */
  original: Promise<WorkInterface> | Identifier;

  /**
   * where to find this specific copy
   */
  sources: Promise<SourceInterface[]> | Identifier[];

  /**
   * identifying hash of the file contents
   */
  hash: string;

  /**
   * device location of the copy
   */
  location: string | null;

  /**
   * the ordering of the copies belonging to the same work,
   * lower number is higher ranked
   */
  ranking: number;
}