d feature.
</p>


<h3 id="implicit">Filtering based on implicit features</h3>

<p>An <em>implicit</em> feature is one that an application requires in order to
function properly, but which is <em>not</em> declared in a
<code>&lt;uses-feature&gt;</code> element in the manifest file. Strictly
speaking, every application should <em>always</em> declare all features that it
uses or requires, so the absence of a declaration for a feature used by an
application should be considered an error. However, as a safeguard