When the DSL (http://docopt.org/ http://docopt.org/) was designed, the main goal was just to formalise that pattern-language used for decades in man pages and `

When the DSL (http://docopt.org/ http://docopt.org/) was designed, the main goal was just to formalise that pattern-language used for decades in man pages and `--help` screens. So variations that are conventional (such as `UPPER-CASE` for arguments or `<angular-brackets>` for arguments) are supported.