import { SharedNonVerbalEntity } from './shared-non-verbal-entity.js';
import type { SharedNonVerbalEntityJson } from './shared-non-verbal-entity.js';
export interface FormulaJson extends SharedNonVerbalEntityJson {
    expression?: string | null;
    notation?: string | null;
}
export declare class Formula extends SharedNonVerbalEntity {
    readonly expression: string | null;
    readonly notation: string | null;
    constructor(data?: FormulaJson);
    rdfClass(): string;
    toJSON(): FormulaJson;
    static fromJSON(data: FormulaJson): Formula;
}
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