/**
 * As other project partners want the produced data structures as rdf quads, this module provides
 * serialization capabilities for this purpose.
 * <p>
 * At the time of writing this module I am unaware of any sophisticated rdf library for typescript which allows to serialize objects
 * directly as rdf quads. Therefore, this module provides a simple serialization mechanism based on the popular n3.js library.
 *
 * @module
 */
import type { MergeableRecord } from './objects';
import type { NodeId } from '../r-bridge/lang-4.x/ast/model/processing/node-id';
type RecordForQuad = Record<string, unknown>;
type DataForQuad = Record<string, unknown> | ArrayLike<unknown>;
type ContextForQuad = string;
/**
 * Predicate that allows you to ignore given elements based on their key/value
 *
 * @returns true if the given key/value should be ignored, false otherwise
 */
export type QuadIgnoreIf = (key: string, value: unknown) => boolean;
/**
 * Deterministically retrieve a unique id for a given object.
 * @param obj - The object to retrieve the id for
 * @param context - to provide unique ids even for different contexts, we add the context to the id.
 */
export type QuadIdRetriever = (obj: unknown, context: ContextForQuad) => string;
/**
 * Either a constant string or a supplier depending on the object in question
 */
export type QuadContextRetriever = ContextForQuad | ((obj: DataForQuad) => ContextForQuad);
/**
 * A deterministic counting id generator for quads.
 */
export declare function defaultQuadIdGenerator(): QuadIdRetriever;
export declare function defaultQuadIgnoreIf(): QuadIgnoreIf;
/**
 * See {@link DefaultQuadSerializationConfiguration} for defaults.
 */
export interface QuadSerializationConfiguration extends MergeableRecord {
    /**
   * Ignore certain keys or values when serializing to quads.
   * @see defaultQuadIgnoreIf
   */
    ignore?: QuadIgnoreIf;
    /**
   * Retrieve a unique id for a given object.
   * @see defaultQuadIdGenerator
   */
    getId?: QuadIdRetriever;
    /**
   * The context of the serialized quads, probably the file-name (constant) or whatever is desired.
   */
    context: QuadContextRetriever;
    /**
   * The basic domain name to use for the quads.
   */
    domain?: string;
}
export declare const DefaultQuadSerializationConfiguration: Required<QuadSerializationConfiguration>;
/**
 * Serializes the given object or array to rdf quads.
 *
 * @param obj    - The object to serialize (must be a Record and no array etc.)
 * @param config - Further configuration options
 *
 * @returns the serialized quads
 *
 * @see graph2quads
 */
export declare function serialize2quads(obj: RecordForQuad, config: QuadSerializationConfiguration): string;
export type VertexInformationForQuad<AdditionalInformation extends MergeableRecord> = MergeableRecord & AdditionalInformation & {
    id: NodeId;
};
export type EdgeInformationForQuad<AdditionalInformation extends MergeableRecord> = MergeableRecord & AdditionalInformation & {
    from: NodeId;
    type: NodeId | NodeId[];
    to: NodeId;
};
export interface GraphInformationForQuad<AdditionalVertexInformation extends MergeableRecord, AdditionalEdgeInformation extends MergeableRecord> extends MergeableRecord {
    rootIds: NodeId[];
    vertices: VertexInformationForQuad<AdditionalVertexInformation>[];
    edges: EdgeInformationForQuad<AdditionalEdgeInformation>[];
    additional?: DataForQuad;
}
/**
 * Serializes the given directed graph to rdf quads.
 * This is a mere (type-)convenience wrapper for {@link serialize2quads}.
 *
 * @see serialize2quads
 */
export declare function graph2quads<AdditionalVertexInformation extends MergeableRecord, AdditionalEdgeInformation extends MergeableRecord>(graph: GraphInformationForQuad<AdditionalVertexInformation, AdditionalEdgeInformation>, config: QuadSerializationConfiguration): string;
export {};