title: What is the meaning of the asterisk (*) when referring to Android XML resources?
body: <p>What is the meaning of this Android code?</p>
  
  <p>What is the difference between <code>*</code> ,<code>+</code> and empty:</p>
  
  <pre><code>@*android:id
  </code></pre>
  
  <p>like this in android_ics/packages/apps/Setting/res/layout</p>
  
  <pre><code>&lt;TextView android:id="@*android:id/timeDisplayForeground"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:singleLine="true"
      android:ellipsize="none"
      android:textSize="@dimen/crypt_clock_size"
      android:textAppearance="?android:attr/textAppearanceMedium"
      android:textColor="@color/crypt_keeper_clock_foreground"
      android:layout_alignLeft="@*android:id/timeDisplayBackground"
      android:layout_alignTop="@*android:id/timeDisplayBackground"
      android:layout_marginBottom="6dip" /&gt;
  </code></pre>