g 2 way data binding),
    or a DataView (offering 1 way data binding).
    Items are regular objects and can contain the properties <code>start</code>,
    <code>end</code> (optional), <code>content</code>,
    <code>group</code> (optional), <code>className</code> (optional),
    <code>editable</code> (optional), and <code>style</code> (optional).
  </p>

  <p>
    A DataSet is constructed as:
  </p>

<pre class="prettyprint lang-js">
var items = new vis.DataSet([
  {
    start: new Date(2010, 7, 15),
    