/**
 * DEC-097 — SysML v2 interop, slice S1 (spec: docs/sysml-interop.md, DEC-081).
 * The pure model reference: `H2ASysmlRef` pins a SysML v2 element at an
 * immutable commit. Embedded in an ENGAGEMENT/CONTRACT body it is ordinary
 * signed content (DEC-035/073) — signing the envelope pins the model state
 * *"I commit to {project, commit, element}"* without h2a moving any bytes.
 *
 * Pure + total: no I/O. The fetch/re-hash/verify adapter is S2 (cli runtime);
 * here are only the type, a total validator, a type guard, and equality.
 */
export declare const H2A_SYSML_REF_KIND = "sysmlv2";
export interface H2ASysmlRef {
    readonly kind: typeof H2A_SYSML_REF_KIND;
    /** Repository base URL (omit if implied by context). */
    readonly apiBase?: string;
    /** Project id. */
    readonly project: string;
    /** Immutable Commit id — freezes the state. */
    readonly commit: string;
    /** Optional Element id (omit = whole project at commit). */
    readonly element?: string;
    /** Optional canonical hash of the element (content integrity, §4). */
    readonly elementHash?: string;
}
export type H2ASysmlRefValidationError = "kind-not-sysmlv2" | "project-missing" | "commit-missing" | "apiBase-empty" | "element-empty" | "elementHash-empty";
export interface H2ASysmlRefValidation {
    readonly ok: boolean;
    readonly errors: readonly H2ASysmlRefValidationError[];
}
/**
 * Total validation of a ref: required `kind`/`project`/`commit`; optional
 * `apiBase`/`element`/`elementHash` must be non-empty strings when present.
 */
export declare function validateSysmlRef(ref: H2ASysmlRef): H2ASysmlRefValidation;
/** Type guard for untyped input (e.g. a ref pulled from an envelope body). */
export declare function isH2ASysmlRef(value: unknown): value is H2ASysmlRef;
/**
 * Strict structural equality over all fields (incl. `apiBase` and
 * `elementHash`). Two refs to the same {project, commit, element} on different
 * mirrors, or with/without a content hash, are deliberately **not** equal —
 * see the reversible decision in docs/loop-decisions.md (a looser
 * `sameModelState` predicate can be added later if needed).
 */
export declare function sysmlRefEquals(a: H2ASysmlRef, b: H2ASysmlRef): boolean;
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