/**
 * Provenance Chain Validator
 *
 * Validates a `Provenance` resource's linkage to the resources it describes.
 * The FHIR Provenance resource records information about the entity, activity
 * and agent involved in producing a piece of data — so the chain it creates
 * between authoring agents and target resources is a core data-quality signal.
 *
 * This validator checks the **structural** aspects of the chain (the parts
 * that do not require network access):
 *
 * 1. `Provenance.target` MUST be present and non-empty
 * 2. Every `target.reference` MUST be a well-formed FHIR reference
 *    (`ResourceType/id`, canonical URL, absolute URL, or `urn:uuid:…`)
 * 3. `Provenance.recorded` MUST be present and MUST be a valid FHIR `instant`
 * 4. `Provenance.agent` SHOULD contain at least one entry, and each agent
 *    SHOULD have either `who.reference` or `who.identifier`
 * 5. `Provenance.occurredDateTime` / `Provenance.occurredPeriod`, when
 *    present, SHOULD NOT post-date `recorded` (provenance cannot be recorded
 *    before the event it describes)
 *
 * Remote resolution of `target.reference` (checking that each referenced
 * resource actually exists on the current FHIR server) is shared with the
 * generic remote reference existence check in §4.1.4 of the PRD and is
 * therefore **out of scope** here. This keeps provenance validation
 * deterministic and offline-safe.
 */
import type { ValidationIssue } from '../types';
/**
 * Validate a Provenance resource's chain linkage.
 *
 * Returns an empty array when `resource.resourceType !== 'Provenance'` so
 * callers can pass any resource without branching.
 */
export declare function validateProvenanceChain(resource: unknown): ValidationIssue[];
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