What is the purpose of the file "drawables.xml" under the "values" directory? : <p>For an android studio project, I found a file named "drawables.xml" in the "values" folder</p>

<pre><code>&lt;resources xmlns:android="http://schemas.android.com/apk/res/android"&gt;
    &lt;item name="ic_menu_camera" type="drawable"&gt;@android:drawable/ic_menu_camera&lt;/item&gt;
    &lt;item name="ic_menu_gallery" type="drawable"&gt;@android:drawable/ic_menu_gallery&lt;/item&gt;
    &lt;item name="ic_menu_slideshow" type="drawable"&gt;@android:drawable/ic_menu_slideshow&lt;/item&gt;
    &lt;item name="ic_menu_manage" type="drawable"&gt;@android:drawable/ic_menu_manage&lt;/item&gt;
    &lt;item name="ic_menu_share" type="drawable"&gt;@android:drawable/ic_menu_share&lt;/item&gt;
    &lt;item name="ic_menu_send" type="drawable"&gt;@android:drawable/ic_menu_send&lt;/item&gt;
&lt;/resources&gt;
</code></pre>

<p>What's the purpose of this file? Why does it create another reference to an existing drawable and why not just use "@android:drawable/ic_menu_camera"?</p>
