hat may be thrown.
 </p>

 <p class="changed_modified_2_3">
 Take note a compliant implementation has to ensure that:
 </p>
 <ul>
 <li>the new UIViewRoot must be set as the FacesContext's viewRoot before applying the tag handlers, restoring the old
 FacesContext in a finally block.</li>
 <li>The contents of the current UIViewRoot's ViewMap must be copied to the ViewMap of the new UIViewRoot before
 applying the tag handlers.</li>
 <li class="changed_added_2_3">The <a href="../component/UIImportConstants.htm