pe, restriction}
where  name is the name of the option used in allopts or opts</pre><pre>      default_value   (==&gt; defopts(1) ~ default allopts structure)
      restriction ... depending on the type, restriction to the accepted values
      type: 'O' other, no restriction, no checking (e.g. usr_prn)
            'S' string, no restriction
            'I', 'R' integer or real within range restriction(1)~restriction(2)
            'M' multiple choice - one of the elements in array restriction
   defopts = 