Difference among reference|color and color
<p>I was wondering, is there any differences among </p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;resources&gt;

&lt;attr name="titleColor" format="reference|color" /&gt;

&lt;/resources&gt;
</code></pre>

<hr>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;resources&gt;

&lt;attr name="titleColor" format="color" /&gt;

&lt;/resources&gt;
</code></pre>

<hr>

<p>As either ways workable for the below 2 themes</p>

<pre><code>&lt;style name="AppTheme.MyDark" parent="android:Theme"&gt;
   &lt;item name="titleColor"&gt;#FFFFFF&lt;/item&gt;
&lt;/style&gt;
</code></pre>

<hr>

<pre><code>&lt;style name="AppTheme.MyDark" parent="android:Theme"&gt;
   &lt;item name="titleColor"&gt;@color/theColorReference&lt;/item&gt;
&lt;/style&gt;
</code></pre>
