title: JSF doesn't support cross-field validation, is there a workaround?
body: <p>JSF 2.0 only allows you to validate the input on one field, like check to see if it's a certain length. It doesn't allow you to have a form that says, "enter city and state, or enter just a zip code." </p>
  
  <p>How have you gotten around this? I'm only interested in answers that involve the validation phase of JSF. I'm not interested in putting validation logic in Managed Beans.</p>