Unique keys in data structures with handlebars templating

template.js

// typical input data
// Years and semesters need to be unique so they are stored as keys

var data = {
    count: 2,
    found: 5,
    results: {
        '2011': {'Semester 1': {url: 'http://site.nz/?pid=401067'}},
        '2012': {
            'Semester 1': {url: 'http://site.nz/?pid=493997'},
            'Semester 2': {url: 'http://site.nz/?pid=493945'}
        }
    },
};

// handlebars template would go like this

/*
<ul>
 {{#each data.results}}
     <li>{{@key}}
         {{#each this}}
            <a href="{{url}}">{{@key}}</a>
         {{/each}}
     </li>
 {{/each}}
</ul>
*/

// html output

/*
<ul>
    <li>2011
        <a href="http://site.nz/?pid=401067">Semester 1</a>
    </li>
    <li>2012
        <a href="http://site.nz/?pid=493997">Semester 1</a>
        <a href="http://site.nz/?pid=493945">Semester 2</a>
    </li>
</ul>
*/