For example, In many of my objects I have a date property (not the same as date created). At the moment I have to create a separate one for each object. This means that, if I create a multi-object query , I am currently unable to sort them in a combined chronological order. The best I can do is sort each object's date property so that , for example all my events will be listed in chronological order and below that all my documents will be sorted in chronological order.