Directive template unique IDs for elements in AngularJS

Question

I have a directive that can be used multiple times on a page. In the template of this directive, I need to use IDs for an input-Element so I can "bind" a Label to it like so:

<input type="checkbox" id="item1" /><label for="item1">open</label>

Now the problem is, as soon as my directive is included multiple times, the ID "item1" is not unique anymore and the label doesn't work correctly (it should check/uncheck the checkbox when clicked).

How is this problem fixed? Is there a way to assign a "namespace" or "prefix" for the template (like asp.net does with the ctl00...-Prefix)? Or do I have to include an angular-Expression in each id-Attribute which consists of the directive-ID from the Scope + a static ID. Something like:

<input type="checkbox" id="{{directiveID}} + 'item1'" /><label for="{{directiveID}} + 'item1'">open</label>

Edit:

My Directive

module.directive('myDirective', function () {
    return {
        restrict: 'E',
        scope: true, 
        templateUrl: 'partials/_myDirective.html',
        controller: ['$scope', '$element', '$attrs', function ($scope, $element, $attrs) {
            ...
        } //controller
    };
}]);

My HTML

<div class="myDirective">
  <input type="checkbox" id="item1" /><label for="item1">open</label>
</div>

Answer 1

HTML

    <div class="myDirective">
        <input type="checkbox" id="myItem_{{$id}}" />
        <label for="myItem_{{$id}}">open myItem_{{$id}}</label>
    </div>