title: What is Mvel dialect in Drools?
body: <p>I am new to Drools. I am creating a rule but I get a compile time error</p>
  
  <blockquote>
    <p>"field is not visible'. </p>
  </blockquote>
  
  <p>I've tried to check with Jboss examples, where they use <strong>dialect "mvel"</strong>. It compiled. I didn't understand about dialect. So what is <code>dialect=mvel</code>?</p>