ats are currently supported:</p>
<ul>
<li><p><code>variable in expression</code> – where variable is the user defined loop variable and <code>expression</code>
is a scope expression giving the collection to enumerate.</p>
<p>For example: <code>album in artist.albums</code>.</p>
</li>
<li><p><code>(key, value) in expression</code> – where <code>key</code> and <code>value</code> can be any user defined identifiers,
and <code>expression</code> is the scope expression giving the collection to enumerate.</p>