Description of the illustration clause_options.eps

OPTION
{ { = ( 'clause_option' | 'clause_option_pattern'
        [, 'clause_option' | 'clause_option_pattern' ]... ) }
| { = ( 'clause_option' ) option_values }
| { ALL [ EXCEPT = ( 'clause_option' | 'clause_option_pattern'
                     [, 'clause_option' | 'clause_option_pattern' ]... ) ] }
}