/**
 * Metadata similarity functions for comparing local vs remote reference metadata.
 */
type AuthorName = {
    family?: string;
    given?: string;
    literal?: string;
};
/**
 * Check if two titles are similar using Jaccard similarity and Containment coefficient.
 * Returns true (similar) if Jaccard >= 0.5 OR Containment >= 0.8.
 * Returns true if either title is empty/undefined (not enough data to compare).
 */
export declare function isTitleSimilar(local: string | undefined, remote: string | undefined): boolean;
/**
 * Check if author lists are similar using family name overlap ratio.
 * Overlap = |local_families ∩ remote_families| / |local_families|
 * Returns true (similar) if overlap >= 0.5.
 * Returns true if either side has no authors (not enough data).
 */
export declare function isAuthorSimilar(local: AuthorName[] | undefined, remote: AuthorName[] | undefined): boolean;
export {};
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