declare namespace Ext {
    export namespace data {
        export namespace schema {
            export interface ReferenceConfig {
                association?: string;
                child?: string;
                getterName?: string;
                inverse?: string | object;
                parent?: string;
                reader?: object;
                role?: string;
                setterName?: string;
                type?: string;
                unique?: boolean;
            }

            export class Reference   {
            }
        }
    }
}