SVG.Container = SVG.invent({
  // Initialize node
  create: function(element) {
    this.constructor.call(this, element)
  }

  // Inherit from
, inherit: SVG.Parent

  // Add class methods
, extend: {
    // Get the viewBox and calculate the zoom value
    viewbox: function(v) {
      if (arguments.length == 0)
        // act as a getter if there are no arguments 
        return new SVG.ViewBox(this)
      
      // otherwise act as a setter 
      v = arguments.length == 1 ?
        [v.x, v.y, v.width, v.height] :
        [].slice.call(arguments)
      
      return this.attr('viewBox', v)
    }
  }
  
})