/**
 * Metadata for relations providing additional context and information
 */
export interface RelationMetadata {
    /**
     * Array of relation IDs that this relation was inferred from
     */
    inferredFrom?: string[];
    /**
     * Timestamp when the relation was last accessed/retrieved
     */
    lastAccessed?: number;
    /**
     * Timestamp when the relation was created
     */
    createdAt: number;
    /**
     * Timestamp when the relation was last updated
     */
    updatedAt: number;
}
/**
 * Represents a relationship between two entities in the knowledge graph
 */
export interface Relation {
    /**
     * The source entity name (where the relation starts)
     */
    from: string;
    /**
     * The target entity name (where the relation ends)
     */
    to: string;
    /**
     * The type of relationship between the entities
     */
    relationType: string;
    /**
     * Optional strength of the relationship (0.0-1.0)
     * Higher values indicate stronger relationships
     */
    strength?: number;
    /**
     * Optional confidence score (0.0-1.0)
     * Represents how confident the system is about this relationship
     * Particularly useful for inferred relations
     */
    confidence?: number;
    /**
     * Optional metadata providing additional context about the relation
     */
    metadata?: RelationMetadata;
}
export declare namespace Relation {
    function isRelation(obj: any): boolean;
    function hasStrength(obj: any): boolean;
    function hasConfidence(obj: any): boolean;
    function hasValidMetadata(obj: any): boolean;
}
export declare class RelationValidator {
    /**
     * Validates if an object conforms to the Relation interface
     */
    static isRelation(obj: any): boolean;
    /**
     * Checks if a relation has a strength value
     */
    static hasStrength(obj: any): boolean;
    /**
     * Checks if a relation has a confidence value
     */
    static hasConfidence(obj: any): boolean;
    /**
     * Checks if a relation has valid metadata
     */
    static hasValidMetadata(obj: any): boolean;
}