"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.
