accordionGroup.tpl.html

<div class="accordion-group">
    <div class="accordion-heading">
        <a class="accordion-toggle" data-toggle="collapse" data-target="#{{$ctrl.id}}-body" ng-transclude="heading"></a>
    </div>
    <div id="{{$ctrl.id}}-body" class="accordion-body collapse">
        <div class="accordion-inner" ng-transclude="body"></div>
    </div>
</div>