In dbAnywhere, a ProjLink is an interface to bind GUI (Graphic User Interface)
objects to a particular column of the database. A ProjLink interface provides methods
for the GUI object to report data changes to the database
(notifySetData) and for the database to report changes to the
(notifyDataChange). For example if you had a dbAware GUI
it would implement the ProjLink interface. There would be a ProjBinder object to glue
it to RelationView object. The GUI
a setBinding method that creates the link by calling RelationView.bindProj.
setBinding is not part of the ProjLink interface.