I read [this example](http://developer.android.com/reference/android/graphics/drawable/AnimationDrawable.html) and I'm trying to use it. I put this in drawable folder as `somth.xml`:

```
 <animation-list android:id="selected" android:oneshot="false">
    <item android:drawable="@drawable/img1" android:duration="50" />
    <item android:drawable="@drawable/img2" android:duration="50" />
 </animation-list>

```

I also put it in anim folder I try to add header like:

```
<?xml version="1.0" encoding="utf-8"?>

```

But give me an error like this:

> 
> Error in an XML file: aborting build.
> 
> 
> 

What is wrong?