code: function (x, y, width, height) {
  		var wrapper,
  			id = PREFIX + idCounter++,
  
  			clipPath = this.createElement('clipPath').attr({
  				id: id
  			}).add(this.defs);
  
  		wrapper = this.rect(x, y, width, height, 0).add(clipPath);
  		wrapper.id = id;
  		wrapper.clipPath = clipPath;
  
  		return wrapper;
  	}
docs: Define a clipping rectangle
  @param {String} id
  @param {Number} x
  @param {Number} y
  @param {Number} width
  @param {Number} height