import { BaseXMLExtractor } from './base.extractor.js';
/**
 * Standard PDF XML extractor that extracts XML from embedded files
 * Works with PDF/A-3 documents that follow the standard for embedding files
 */
export declare class StandardXMLExtractor extends BaseXMLExtractor {
    /**
     * Extract XML from a PDF buffer using standard PDF/A-3 embedded files
     * @param pdfBuffer PDF buffer
     * @returns XML content or null if not found
     */
    extractXml(pdfBuffer: Uint8Array | Buffer): Promise<string | null>;
}