import { XmlNode } from './XmlNode.js';
/**
 * A document type declaration within an XML document.
 *
 * @example
 *
 * ```xml
 * <!DOCTYPE kittens [
 *   <!ELEMENT kittens (#PCDATA)>
 * ]>
 * ```
 */
export declare class XmlDocumentType extends XmlNode {
    /**
     * Name of the root element described by this document type declaration.
     */
    name: string;
    /**
     * Public identifier of the external subset of this document type declaration,
     * or `null` if no public identifier was present.
     */
    publicId: string | null;
    /**
     * System identifier of the external subset of this document type declaration,
     * or `null` if no system identifier was present.
     */
    systemId: string | null;
    /**
     * Internal subset of this document type declaration, or `null` if no internal
     * subset was present.
     */
    internalSubset: string | null;
    constructor(name: string, publicId?: string, systemId?: string, internalSubset?: string);
    get type(): string;
    toJSON(): import("./types.js").JsonObject;
}
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