What does the ? in Android XML mean
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/2733907/question-mark-in-xml-attributes-for-android">Question mark (?) in XML attributes for Android</a>  </p>
</blockquote>



<pre><code>&lt;TextView android:id="@+android:id/title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:singleLine="true"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:ellipsize="marquee"
        android:fadingEdge="horizontal" /&gt;
</code></pre>

<p>what does "?android:attr/textAppearanceLarge" do? Does it have a name? Why doesn't it use an "@" instead? Can I use this syntax in my own code? Where can I read more about this? Since I don't know what it is, it's kind of hard to find more information about it. Any guidance would be greatly appreciated. </p>
