h <a href="api/ng/type/$rootScope.Scope#$watchCollection"><code>$watchCollection</code></a>: use <code>=*</code> or <code>=*attr</code> (<code>=*?</code> or <code>=*?attr</code> if the attribute is optional).</p>
</li>
<li><p><code>&lt;</code> or <code>&lt;attr</code> - set up a one-way (one-directional) binding between a local scope property and an
expression passed via the attribute <code>attr</code>. The expression is evaluated in the context of the
parent scope. If no <code>attr</code> name is specified