import { Annotation, JSONObject } from "../internals";
export declare class UnknownAnnotation extends Annotation<{
    type: string;
    attributes: JSONObject;
}> {
    static vendorPrefix: string;
    static type: string;
    get rank(): number;
    toJSON(): {
        id: string;
        start: number;
        end: number;
        type: string;
        attributes: any;
    };
}
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