"PredicateEditorSample" is a Cocoa application that demonstrates how to use 
the ``NSPredicateEditor`` class.  The ``NSPredicateEditor`` class is a 
subclass of ``NSRuleEditor`` that is specialized for editing ``NSPredicate`` 
objects.  This sample is intended to show how to use the many different 
features and aspects of this control and leverages Spotlight to search your 
Address Book.