Read the value of a class constant.

This is the same as just typing self::CONSTANTNAME, but throws a more useful message if the constant is not defined and allows the constant to be limited to a maximum length.

Provide brief usage examples of common calling conventions, like:

$workflow->setExamples("**delete** __file__ [__options__]");

This text is shown in both brief and detailed help, and should give the user a quick reference for common uses. You can separate several common uses with newlines, but usually should not provide more than 2-3 examples.

Provide a brief description of the command, like "Delete a file.".

This text is shown in both brief and detailed help, and should give the user a general idea of what the workflow does.

Provide a full explanation of the command. This text is shown only in detailed help.

Normally, workflow arguments are parsed fully, so unexpected arguments will raise an error. You can return true from this method to parse workflow arguments only partially. This will allow you to manually parse remaining arguments or delegate to a second level of workflows.