title: play japid Why can't we use variable parameters
body: <pre><code>@String idBase="[sys]/prmode/add";
  @String htmlName="addDept";
  @Strig title="add";
  @extends japidviews.web.bk._main.html(title,htmlName,idBase)
  </code></pre>
  
  <p>Japid Compilation Error
  japidviews/web/bk/prmode/addDept.java(68): The field _main.title is not visible </p>
  
  <pre><code>public cn.bran.japid.template.RenderResult render() {
  
  67      long __t = -1;
  
  68      try {super.layout(title,htmlName,idBase);} catch (RuntimeException e) {    super.handleException(e);} 
  
  69      return new cn.bran.japid.template.RenderResultPartial(getHeaders(), getOut(), __t, actionRunners, sourceTemplate);
  
  70  }
  </code></pre>