anchor.diff:  }
   
   @Directive (selector: "accordion-transclude, [accordion-transclude]",
  -    properties: const [ "accordionTransclude"])
  +    inputs: const [ "accordionTransclude"])
   class AccordionTransclude implements OnInit {
     ViewContainerRef viewRef;
   
  
positive.code: // todo: support template url
  
  // todo: support custom `open class`
  @Component (selector: "accordion-group, [accordion-group]",
      inputs: const [
        "templateUrl", "heading", "isOpen", "isDisabled", "panelClass"],
      host: const { "[class.panel-open]" : "isOpen"})
  @View (template: '''
    <div class="panel" [ng-class]="panelClass">
      <div class="panel-heading" (click)="toggleOpen(\$event)">
        <h4 class="panel-title">
  
negative.code: 
  // todo: support template url
  @Component (selector: "accordion, [accordion]",
      inputs: const [ "templateUrl", "closeOthers"],
      host: const { "[class.panel-group]" : "true"})
  @View (template: '''<ng-content></ng-content>''')
  class Accordion {
  