Magnus, this is done because categories (as well as all other lists) are potentially huge in size, and might require paging. You do not want to be in a situation where you asked for many titles, but only retrieved some of the data for just the first - because then you will have to continue from that point, plus re-submit all other items. Now imagine that a generator made that list - so every time the generator will have to remake that list, just so that the query may continue from the parts of the first item. All this may create extremely in-efficient execution. Hence, it is easier for the client to make one request to get a list of categories, and more requests to get info for each category. On 7/16/07, Magnus Manske <magnusmanske(a)googlemail.com> wrote: