Artifact
constructor(contents: ArtifactContent? = null, description: Message? = null, encoding: String? = null, hashes: Map<String, String>? = null, lastModifiedTimeUTC: String? = null, length: Long? = null, location: ArtifactLocation? = null, mimeType: String? = null, offset: Long? = null, parentIndex: Long? = null, properties: PropertyBag? = null, roles: List<Role>? = null, sourceLanguage: String? = null)