ns-NotificationCenter.xml

<Namespace Name="NotificationCenter">
  <Docs>
    <summary>The NotificationCenter namespace provides classes for creating and updating widgets in the Today view.</summary>
    <remarks>
      <para>The NotificationCenter namespace, added in iOS 8, allows the creations of widgets, that is, extensions to the Today view.</para>
    </remarks>
  </Docs>
</Namespace>