Setting option defaults

You can set default values for options in the following ways: In the option definition. This is the most common and visible place to set a default. Using a module constraint to set a default value. Using a module constraint to fix a default value that cannot be overridden by the user. In the refrigerator freezer example, for some models, the freezer may always be at the bottom and the refrigerator at the top. In this case, the value for the application option would be fixed for each path in the refrigerator freezer module.

Note When using a global option definition, you can override a default set in the global definition in the module in which the global option definition is used.