All keywords in a command are required except when an option is available.
Optional keywords are indicated in the command scheme with the following signs enclosing the keywords concerned:
| KEY1word ...... data ....... | < > | KEY2word ...... data ....... |For the above example it may appear as:
| KEY2word data | KEY1word < > | KEY3word data |In case the user does not indicate an option in a command, SWASH chooses the alternative indicated with an arrow (->) appearing in the command scheme (the default option). In the above example, it may appear as:
| KEY2word data | KEY1word < > | -> KEY3word data |where KEY3WORD is the default option.