/**
 * Identifies beginning of new message and session protocol version by means of a session profile identifier (see FIX Session Layer for details). ALWAYS FIRST FIELD IN MESSAGE. (Always unencrypted).
 * - Tag: 8
 * - FIX Specification type: String
 * - Mapped type: string
 * @readonly
 * @public
 */
export declare const BeginString: Readonly<{
    /** Session profile FIX.4.2 */
    readonly FIX42: "FIX.4.2";
    /** Session profile FIX4 */
    readonly FIX44: "FIX.4.4";
    /** Session profile FIXT or LFXIT
        The choice between FIXT and LFIXT is subject to counterparty agreement. */
    readonly FIXT11: "FIXT.1.1";
}>;
export type BeginString = (typeof BeginString)[keyof typeof BeginString];