title: Drools - Ability to define rules at runtime?
body: <p>It is possible to define rules dynamically completely at runtime ? 
  Also change the ruleset at runtime. </p>
  
  <p>For example, </p>
  
  <pre><code>at time = t_1 the ruleset is { R1, R2, R3 } 
  at time = t_2 the ruleset is { R1, R3, R4 } 
  ..... 
  </code></pre>
  
  <p>R1, R2 are rules that are defined at runtime. </p>
  
  <p>Thanks. </p>