docs: function _lock_map(field, id_list){
  	var fixed_list = [];
  	bbop.core.each(id_list,
  		       function(item){
  			   fixed_list.push(bbop.core.ensure(item, '"'));
  		       });
  
  	var base_id_list = '(' + fixed_list.join(' OR ') + ')';
  
  	var ret_query = field + ':' + base_id_list;
  	return ret_query;
  	
      }