Possible to filter attributes returned?

[Andrew Davison <andrew@infradig.com>]

It's possible to specify a filter using attributes to select entries returned, but doesn't seem to be possible to filter the actual
attributes returned, instead all attributes are returned for the selected entries. Using the example of a 'Groups' 'ou' with a
'member' attribute, it seems you have to return all the members of the group even if you  want just a subset. If you had a million
members of a group this is not very efficient. Perhaps i'm missing something?

Or maybe that's not the best way to do membership (though the UMich docs seem to imply it is ok). Perhaps each member should have an
entry with a 'memberof' attribute for each group they belong to.

Any thoughts on how to do groups/lists?