Hello! After some discussion, sorting support for zope.index was added. It's now in zope.index 3.5.0. So, the next step is to add sorting/limiting/reversing to zope.app.catalog. I made a "nadako-sorting" branch of zope.app.catalog. It modifies the ``searchResults`` method of the catalog so it makes use of special keyword arguments, passed to it (i believe that's just like zope 2 catalog works). The names are: * _sort_index - the name of index to sort with * _reverse - reverse results * _limit - limit result set I added an underscore to the names to mark them as something special, not just index names and to avoid conflicting with index names that applications might use. I think there's no application on earth that has indexes with the names above, so that's not a problem. If _sort_index is not specified, catalog just uses list mechanisms to limit/reverse results. I don't think that makes any sense though. If _sort_index is specified, all sorting, reversing and limiting functionality is done by the ``sort`` method of specified index. That index should provide the new IIndexSort interface, defined by zope.index. I would like to merge that code to zope.app.catalog trunk and make a new feature release, containing this functionality. So I'd like community to review these changes and comment/object it. Thanks! -- WBR, Dan Korostelev