Interface PackagingMetadataObject

interface PackagingMetadataObject {
    creator: string;
    description: string;
    direction: string;
    flow: string;
    identifier: string;
    language: string;
    layout: string;
    media_active_class: string;
    minSpreadWidth?: number;
    modified_date: string;
    orientation: string;
    pubdate: string;
    publisher: string;
    rights: string;
    spread: string;
    title: string;
    viewport: string;
}