The source code

    /**
     * @ignore
     *  dd support for kissy
     * @author yiminghe@gmail.com
     */
    KISSY.add('dd/base', function (S, DDM, Draggable, DraggableDelegate) {

        var DD = {
            Draggable: Draggable,
            DDM: DDM,
            DraggableDelegate: DraggableDelegate
        };

        KISSY.DD = DD;

        return DD;
    }, {
        requires: [
            './base/ddm',
            './base/draggable',
            './base/draggable-delegate'
        ]
    });