import { Contributors as Collection } from './Contributor';
/**
 * BelongsTo Object for the Readium Web Publication Manifest.
 * https://readium.org/webpub-manifest/schema/contributor-object.schema.json
 */
export declare class BelongsTo {
    /**
     * Map of [BelongsTo] items.
     */
    readonly items: Map<string, Collection>;
    /** Creates an Array of [Subject]. */
    constructor(values?: {
        items?: Map<string, Collection>;
    });
    /**
     * Parses a [BelongsTo] from its RWPM JSON representation.
     */
    static deserialize(json: any): BelongsTo | undefined;
    /**
     * Serializes a [BelongsTo] to its RWPM JSON representation.
     */
    serialize(): any;
}
