/** The document metadata projected into an XMP packet by {@link buildXmpPacket}. */
export interface XmpInput {
    readonly title?: string;
    readonly author?: string;
    readonly subject?: string;
    readonly keywords?: string;
    /** Application that created the doc (`xmp:CreatorTool`). */
    readonly creator?: string;
    readonly producer?: string;
    readonly createDate?: Date;
    readonly modifyDate?: Date;
    /**
     * PDF/A identifier: part 1 (ISO 19005-1) / 2 / 3; conformance level
     * `'A'` (tagged) / `'B'` (visual) / `'U'` (Unicode — parts 2/3 only).
     */
    readonly pdfaPart?: '1' | '2' | '3';
    /** PDF/UA identification (ISO 14289-1) — `pdfuaid:part`. */
    readonly pdfuaPart?: '1';
    readonly pdfaConformance?: 'A' | 'B' | 'U';
}
/**
 * Build an XMP metadata packet (ISO 16684-1) for the document `/Metadata`
 * stream, emitting only the sections the supplied {@link XmpInput} populates
 * (PDF/A and PDF/UA identifiers, Dublin Core, XMP basic, Adobe PDF). For PDF/A
 * the standard properties must agree with the `/Info` dictionary.
 *
 * @param input The metadata to project.
 * @returns The UTF-8 encoded XMP packet bytes.
 */
export declare function buildXmpPacket(input: XmpInput): Uint8Array;