code: public void copy( Model source, Model target )
      {
  
          V value = get( source );
          if ( value != null )
          {
              set( target, value );
          }
      }
docs: Copies the value identified by this {@link PomProperty} from the given <code>source</code> {@link Model} to the
  given <code>target</code> {@link Model}.
  
  @param source is the {@link Model} to copy from (read).
  @param target is the {@link Model} to copy to (write).