/**
 * Reference Format Validator
 *
 * Validates FHIR Reference.reference string format:
 * - Relative: ResourceType/id
 * - Absolute: http(s)://server/ResourceType/id
 * - Contained: #localId
 * - URN: urn:uuid:xxxx or urn:oid:xxxx
 *
 * This validator ensures reference strings are well-formed according to FHIR specification.
 */
import type { ValidationIssue } from '../types';
export declare class ReferenceFormatValidator {
    /**
     * Validate a reference string format
     */
    validateReferenceString(reference: string, path: string, resourceType: string): ValidationIssue[];
    /**
     * Validate all Reference elements in a resource
     */
    validateAllReferences(resource: any, path?: string): ValidationIssue[];
    /**
     * Recursively traverse resource and validate reference fields
     */
    private traverseAndValidate;
}
export declare const referenceFormatValidator: ReferenceFormatValidator;
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