/**
 * The syntax checks for the URL values of a DID document. Each check uses the grammar of the
 * text that defines the value:
 *
 * - A DID and a DID URL: the ABNF of DID Core v1.1, sections 3.1 and 3.2.
 * - A URI and a relative reference: the ABNF of RFC 3986, sections 3 and 4.2.
 * - A URL: the URL parser of the URL Standard (https://url.spec.whatwg.org/).
 *
 * The regular expressions follow the ABNF rule names. ABNF strings are case-insensitive
 * (RFC 5234, section 2.3), so the `did:` string of the DID ABNF also matches `DID:`.
 */
/**
 * Returns true if the value conforms to the DID syntax of DID Core v1.1, section 3.1.
 * @param {string} value The value.
 * @returns {boolean} True if the value is a DID.
 */
export declare function isDid(value: string): boolean;
/**
 * Returns true if the value conforms to the DID URL syntax of DID Core v1.1, section 3.2. A
 * DID is also a DID URL.
 * @param {string} value The value.
 * @returns {boolean} True if the value is a DID URL.
 */
export declare function isDidUrl(value: string): boolean;
/**
 * Returns true if the value starts with the `did` scheme. The syntax of a URI in the `did`
 * scheme is the DID URL syntax, so such a value must be a DID URL.
 * @param {string} value The value.
 * @returns {boolean} True if the value starts with `did:`.
 */
export declare function hasDidScheme(value: string): boolean;
/**
 * Returns true if the value starts with a scheme: it is not a relative reference.
 * @param {string} value The value.
 * @returns {boolean} True if the value starts with an RFC 3986 scheme and a colon.
 */
export declare function hasScheme(value: string): boolean;
/**
 * Returns true if the value is an RFC 3986 `URI`: a scheme, a colon, and the other parts.
 * @param {string} value The value.
 * @returns {boolean} True if the value is a URI.
 */
export declare function isUri(value: string): boolean;
/**
 * Returns true if the value is an RFC 3986 `relative-ref`: a reference with no scheme.
 * @param {string} value The value.
 * @returns {boolean} True if the value is a relative reference.
 */
export declare function isRelativeReference(value: string): boolean;
/**
 * Returns true if the URL parser of the URL Standard parses the value with no base URL.
 * @param {string} value The value.
 * @returns {boolean} True if the value is an absolute URL.
 */
export declare function isUrl(value: string): boolean;
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