title: Prolog : C-style constant OR alias?
body: <p>Is there a way to define/declare constants/alias in Prolog.</p>
  
  <p>I have a atom that i use often. I want to declare it once and later if I decide to change it to do it in one single place.</p>
  
  <pre><code>def BLAH = blah
  .....
  clause(BLAH(abc,de), true) 
  ... and so on ...
  </code></pre>