In the project navigator, find and select BNRDocument.xib. When you select a file in the project navigator that ends in .xib, Interface Builder opens in the editor area. Instead of code, you will see a layout grid displaying view objects defined in that XIB (XML Interface Builder document) file.
Right now, there are two view objects defined in BNRDocument.xib: a window and a text field. These are instances of NSWindow and NSTextField.
Figure 32.5 Current
If you were to run this application now, a window would appear with the text Your document contents here ...