import { IExtractionResult, IExtractor } from "./IExtractor";
import '../../util';
import DocumentHandler from '../../tools/DocumentHandler';
/**
 * Microdata extraction according to HTML specification
 * @see https://html.spec.whatwg.org/multipage/microdata.html#converting-html-to-other-formats
 */
export declare class MicrodataExtractor implements IExtractor {
    private readonly doc;
    private readonly meta;
    constructor(doc: DocumentHandler);
    /**
     * Extracts items according to HTML specification in format similar to JSON
     * @see https://html.spec.whatwg.org/multipage/microdata.html#json
     * @returns Returns an extraction result
     */
    extract(): Readonly<IExtractionResult>;
    /**
     * Finds top-level items
     * @see https://html.spec.whatwg.org/multipage/microdata.html#json
     */
    private findItems;
    /**
     * Creates a new item
     * @see https://html.spec.whatwg.org/multipage/microdata.html#get-the-object
     * @param element Element to create item from
     * @param memory Memory of used elements
     */
    private createItem;
    /**
     * Parse types of an item element
     * @see https://html.spec.whatwg.org/multipage/microdata.html#item-types
     * @param element Element to parse
     */
    private parseType;
    /**
     * Find properties in root
     * @see https://html.spec.whatwg.org/multipage/microdata.html#the-properties-of-an-item
     * @param root Element to start
     */
    private findProperties;
}