Support for obtaining a subtree within a View

[ceharris]

In some situations, you might have a View as input and desire to only work with a subtree of it with a view applicator. It would be helpful to a means of obtaining a (sub)View from a View, using a path.

e.g.

interface View {

  /**
   * Gets a subview from this view by traversing according to the specified path, which must 
   * terminate at either an <em>object</em> or an <em>array</em>.
   * @param path path to the subview, delimited using the '/' character
   * @return specified subview
   * @throws ViewException if the path cannot be fully traversed or does not end at an object or array
   */
  View subView(String path);

}