title: What rules does software version numbering follow?
body: <p>I have been developing some software and want to give it version numbers.</p>
  
  <p>How do I do this?  </p>
  
  <p>How is it that some software gets two versions like 1.3v1.1</p>
  
  <p>or some have 3 numbers - 4.0.1  </p>
  
  <p>What is the method behind all this?</p>
  
  <p>Thanks.</p>