title: What does "add-resource" in Android resource xml file do?
body: <p>I found that there are following statement in package/apps/UnifiedEmail package in android source code:</p>
  
  <pre><code>&lt;add-resource name="RecipientEditTextViewStyle" type="style" /&gt;
  </code></pre>
  
  <p>What does this "add-resource" element mean? </p>
  
  <p>The source code: <a href="https://github.com/CyanogenMod/android_packages_apps_UnifiedEmail/blob/cm-11.0/res/values/attrs.xml" rel="nofollow noreferrer">https://github.com/CyanogenMod/android_packages_apps_UnifiedEmail/blob/cm-11.0/res/values/attrs.xml</a></p>