/**
  * Retrieve singleton instance of naming lookup object
  *
  * @static
  * @param smdoc $foowd Reference to the foowd environment object.
  * @return Reference to singleton lookup object
  */
 function &getInstance(&$foowd)
 {
     return parent::getInstance($foowd, 'smdoc_name_lookup', META_SMDOC_NAME_LOOKUP_CLASS_ID, SHORTNAMES_ID);
 }
 /**
  * Retrieve singleton instance of application group object
  * @static
  * @param smdoc $foowd Reference to the foowd environment object.
  * @return Reference to singleton application group object
  */
 function &getInstance(&$foowd)
 {
     return parent::getInstance($foowd, 'smdoc_group_appext', META_SMDOC_GROUP_APPEXT_CLASS_ID, APP_GROUPS_ID);
 }