title: In Cobol, to test "null or empty" we use "NOT = SPACE [ AND/OR ] LOW-VALUE" ? Which is it?
body: <p>I am now working in mainframe,
  in some modules, to test </p>
  
  <blockquote>
    <p>Not null or Empty</p>
  </blockquote>
  
  <p>we see :
   <code>NOT = SPACE OR LOW-VALUE</code>
  The chief says that we should do :
  <code>NOT = SPACE AND LOW-VALUE</code></p>
  
  <p>Which one is it ?</p>
  
  <p>Thanks!</p>