title: difference between @id and @android:id
body: <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:orientation="vertical" android:layout_width="fill_parent"
      android:layout_height="fill_parent"&gt;
      &lt;ListView android:id="@android:id/list" android:layout_width="fill_parent"
          android:layout_height="fill_parent" android:layout_weight="1" /&gt;
      &lt;Spinner android:id="@+id/section_spinner"
          android:layout_width="fill_parent" android:layout_height="wrap_content"
          android:layout_margin="5dp" /&gt;
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>what is the difference between @android:id and @id in this case?</p>