AngularJS - Simple Directive Use

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<script src="http://code.angularjs.org/1.0.0/angular-1.0.0.js"></script>
<div ng-app="myApp">
    <div my-foo></div>
</div>

CSS

.ui-state-highlight { background-color: #EEEEEE; }

JavaScript

var xx = angular.module('myApp', []);

xx.directive('myFoo', 
                 function(){
                     return 
                     {
                         template:'23'
                     };                     
});