import { Edition } from "../model/Edition.js";
/**
 * The keys an export derives from the tree, which no node of the
 * edition states itself. An import reads them off again.
 */
export declare const derivedKeys: ReadonlySet<string>;
export declare const exportDate: (date: Date) => string;
/**
 * Writes the edition as a JSON-LD document in the terms of the Roll
 * Edition Ontology. Each copy's features and tears go back to the
 * copy's own places, as they were read, with the alignment beside them,
 * and every version carries the context of its own reproducing system.
 * A reference the edition holds possible, unlikely or false is quoted
 * rather than stated, so that a reader of the RDF does not take it for
 * a fact. The edition given is not changed.
 * @category Reading and writing
 */
export declare const asJsonLd: (edition: Edition) => any;