import { Algebra } from "sparqlalgebrajs";
/**
 * A query engine that takes SPARQL algebra, and outputs SPARQL JSON.
 */
export interface IQueryEngine {
    /**
     * Execute SPARQL algebra against a query engine.
     * @param {Operation} query A SPARQL query in SPARQL algebra.
     * @param options Optional options for the query engine.
     * @return {Promise<any>} Promise resolving to SPARQL JSON.
     */
    query(query: Algebra.Operation, options?: any): Promise<any>;
}