import { IQueryResult } from "rdf-test-suite";
import { ISource } from "./IDataSource";
/**
 * A query engine handler for Linked Data Fragments.
 */
export interface ILdfQueryEngine {
    /**
     * Execute the given query over the given sources.
     * @param {ISource[]} sources An array of sources.
     * @param {string} proxyUrl A proxy URL that should be prefixes to URL-based sources.
     * @param {string} queryString A query string.
     * @param {{[p: string]: any}} options Options that will be passed to the query engine.
     * @return {Promise<IQueryResult>} A promise resolving to a query result.
     */
    queryLdf(sources: ISource[], proxyUrl: string, queryString: string, options: {
        [key: string]: any;
    }): Promise<IQueryResult>;
}