/** The user directory root pages, indexed by workspace, site and sitemap name. */
 protected Map<String, Map<String, Map<String, Set<String>>>> _userDirectoryRootPages;
 /** The list of transitional page workspace --&gt; contentType --&gt; (key : page name -- list&lt;&gt; children pages names) */
 protected Map<String, Map<String, Map<String, SortedSet<String>>>> _transitionalPagesCache;
 /** The list of user page workspace --&gt; v --&gt; (key : page name --&gt; Map(page name, content id)) */
 protected Map<String, Map<String, Map<String, Map<String, String>>>> _userPagesCache;