declare namespace Ext {
    export namespace data {
        export namespace validator {
            export interface PresenceConfig {
                allowEmpty?: boolean;
                message?: string;
            }

            export class Presence extends Ext.data.validator.Validator  {
                public getAllowEmpty(): void;
                public getMessage(): void;
                public setAllowEmpty(): void;
                public setMessage(): void;
            }
        }
    }
}