eed a reference to the page.
        Getting a reference to the page that contains the <code>a</code>-tag can be done using
        <code>pager.getParentPage</code>. Navigating to the sibling pages can be done using
        <code>pager.Page#children</code>-observable array and <code>pager.Page#parentPage</code>.
        Using <code>pager.Page.prototype.nullObject</code> it is possible to make
        the reference robust for race conditions.
    </li>
    <li>
        Calculate the absolute path to the page